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Smart Is The New Sexy.

The Big Bang Theory is a sitcom about two brainiacs with a lot to learn that debuted in September 2007.

Plot:
Leonard and Sheldon can tell their quarks from their quantum physics, but have no clue how women add up. Leave it to their pretty new neighbor, just off a messy breakup, to teach them a thing or two.

The series shows what happens when hyper-intelligent roommates/physicists Sheldon and Leonard meet Penny, a beautiful woman moving in next door--and realize they know next to nothing about life outside of the lab.  Rounding out the crew are the smarmy Wolowitz, who thinks he's as sexy as he is brainy, and Koothrappali, who suffers from an inability to speak in the presence of a woman.


Cast:

Johnny Galecki	Leonard Leakey Hofstadter
Jim Parsons	Sheldon Cooper
Kaley Cuoco	Penny
Simon Helberg	Howard Wolowitz
Kunal Nayyar	Rajesh Koothrappali
Melissa Rauch	Bernadette (Season 3-)
Mayim Bialik	Amy Fowler (Season 4-)

Official site:
description from:  tv.com,  CBS & IMDb
picture from photobucket

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101 - Pilot - aired: 09/24/07
Two brilliant physicists, Leonard and Sheldon, are the kind of "beautiful minds" that understand how the universe works. But none of that genius helps them interact with people, especially women. All this begins to change when a free-spirited beauty named Penny moves in next door. When Leonard and Sheldon meet Penny, Leonard is immediately interested in her, but Sheldon feels his friend is chasing a dream he'll never catch. Sheldon is quite content spending his nights playing Klingon Boggle with their socially dysfunctional friends, fellow Cal Tech scientists Wolowitz and Koothrappali. However, Leonard sees in Penny a whole new universe of possibilities... including love.

102 - The Big Bran Hypothesis - aired: 10/01/07
Sheldon and Leonard go over to Penny's apartment to drop off a package that came for her. Sheldon is deeply disturbed when he sees how messy and disorganized her apartment appears. Later that night, when Leonard is sleeping, Sheldon sneaks into Penny's apartment to clean and organize it. Leonard catches him and tries to stop him, but Sheldon is obsessed. When Penny wakes to find what Sheldon has done she is furious.

103 - The Fuzzy Boots Corrollary - aired: 10/08/07
When Leonard sees Penny kissing a guy in front of her apartment door he is devastated. The guys convince him to ask someone out at work, but when he tries and is brutally turned down by a geeky girl, he is even more depressed. Wolowitz conspires to take them all to salsa class at the community center, where he meets all of his conquests. The women there are all 85 and up or 6 feet tall. Leonard finally decides to ask Penny out to dinner and just when he thinks he is making progress, she tells him that it is too soon for her to start dating again.

104 - The Luminous Fish Effect - aired: 10/15/07
Sheldon is fired from his job as a physicist at the university when he blows up at his boss who he thinks is not a smart as he is. His change of circumstance sends him in to a downward spiral of depression which the boys try to cure by sending for Sheldon's mom. When his mom arrives for a visit, the boys realize his mom is completely the opposite from what they expected. They would never have guessed Sheldon was related to her as she is simple and sweet. But the visit works and she gets Sheldon back on track.

105 - The Hamburger Postulate - aired: 10/22/07
While eating at the restaurant where Penny works, Leonard and Sheldon run into Leslie, a fellow scientist who works with Leonard. Leslie suggests Leonard play in her string quartet, but what she really wants is to get up close and personal on another level. When Sheldon comes home and finds a necktie on Leonard's door, he drops in to Penny’s apartment to her to ask what the necktie means. When Leonard finds out Sheldon has told Penny about his rendezvous with Leslie he is furious. Fearing an imagined love triangle between the two women and himself, Leonard is disappointed to realize all Leslie was interested in was a one-time event.

106 - The Middle Earth Paradigm - aired: 10/29/07
The guys go to Penny's Halloween party. Leonard ends up getting humiliated by Penny’s hunky ex-boyfriend while Sheldon, Wolowitz and Koothrappali try desperately to make a mark on the social scene but with limited success. After the party, Penny is a little drunk and sad after seeing her ex and ends up kissing Leonard.

107 - The Dumpling Paradox - aired: 11/05/07
Penny's promiscous friend comes to town and Wolowitz hooks up with her. This leaves the guys without their fourth wheel. Sheldon goes a little crazy because his world has been thrown off, and Penny has to stay with the guys in their apartment. With Wolowitz preoccupied, the guys discover they are without a fourth member of their group and in desperation they ask Penny to join their Halo team.

108 - The Grasshopper Experiment - aired: 11/12/07
Koothrappali is overwhelmed after his parents arrange a blind date, but he discovers he actually can talk to the opposite sex after a few drinks; however, complications set in when his beautiful date is more interested in Sheldon. Penny has started her new job as a bartender so Koothrappali decides to have the date at her restaurant, but he blows it and Sheldon ends up getting the girl.

109 - The Cooper-Hofstadter Polarization - aired: 03/17/08
When Sheldon and Leonard are invited to present their joint findings at a physics conference, Sheldon refuses. But when Penny steps in to mediate, it only deepens the rift between the two best friends.

110 - The Loobenfeld Decay - aired 03/24/08
The guys are invited by Penny to see her in a performance of Rent, but they know how horribly she sings, so Leonard lies to get out of it. But Sheldon is so disturbed by the lie, that he makes up a very intricate new lie, which he thinks is better. They tell Penny that Sheldon has a cousin who is a drug addict, and they have to do an intervention in Long Beach. They invite over a fellow physicist, who minored in theater in college -- to be the cousin. Penny comes over, and falls for the whole thing.

111- The Pancake Batter Anomaly - aired 03/31/08
When Sheldon comes down with the flu, all the guys escape knowing what he is like when he is sick. Sheldon then turns up at Penny's restaurant asking for soup. She ends up leaving work, and taking care of him.

112 - The Jerusalem Duality - aired 04/14/08
n this episode a 14 year old wunderkind is introduced to the physics lab where Sheldon and Leonard work. Sheldon is threatened by this boy, because he can take Leonard's title of youngest genius away. Sheldon suffers a crisis of confidence, and his friends try to console him. In an attempt to restore his sense of purpose, the boys come up with a solution to derail the newcomer's research.

113 - The Bat Jar Conjecture - aired 04/21/08
The guys engage in the University Physics bowl. But Sheldon is so obnoxious, he is kicked off the team. So he forms his own team with the janitor and the cafeteria lady, and he goes up against his buddies. Leslie Winkel joins Leonard's team and kick Sheldon's butt.

114 - The Nerdvana Annihilation - aired 4/28/08
When the guys buy the old time machine prop from the movie, Penny accuses them of acting like children and tells them to grow up. This prompts Leonard to get rid of all of his nerdmorabilia, as he realizes that girls like Penny don’t end up with guys who have time machines. But when Leonard sees Penny on a date with a gorgeous hunk, he decides to keep his things.

115 - The Pork Chop Indeterminacy - aired 05/05/08
Sheldon's twin sister comes into town, and she is a complete knockout. Leonard, Wolowitz, and Koothrappali go crazy for her and compete for her attention. When Leonard devises a plan to eliminate his rivals, it backfires when Sheldon declares he will decide whom his sister dates.

116 - The Peanut Reaction - aired 05/12/08
The gang finds out that Leonard's birthday is coming up. Penny wants to throw him a party, but she finds out that his family never celebrated his birthdays. Penny decides to throw him a surprise party and enlists Sheldon to help her out. Wolowitz participates by taking Leonard to the emergency room with him, under the pretense that he ate a peanut and is having a massive allergic reaction. By the time they make it back the apartment, the party is over. Penny feels terrible and gives Leonard a big kiss.

117 - The Tangerine Factor (Season Finale) - aired 05/19/08
Penny finally breaks up with her boyfriend, giving Leonard the courage he needs to ask her out on a real date. She agrees to the date. However, before they actually go out, they both seek the “wisdom” of reluctant advisor, Sheldon, on separate occasions.


episode summaries taken from: cbs.com
image from: photobucket

waterlilybarb

Episode 01: The Bad Fish Paradigm
After Penny and Leonard's great date, Leonard tries to kiss Penny in the hallway and realizes that the guys have secretly rigged cameras to spy on them. Penny then tells him that they should take things slow. We find out later when Penny confides in Sheldon that she is actually insecure about not being smart enough for Leonard. She asks Leonard to keep this a secret -- but he is terrible at keeping secrets. After some warm milk laced with valium, he spills the beans to Leonard. Leonard tries to convince Penny that it is not a big deal, but it backfires, and Penny does not want to see him anymore.

Episode 02: The Codpiece Topology
Leonard and Penny are no longer dating. Leslie Winkle moves in on Leonard and proposes to revisit their relationship. Leonard kicks Sheldon out of their apartment so he and Leslie can be on their date alone. Sheldon, who hates Leslie, continually interrupts their date. Sheldon asks Penny for advice on how to break up Leonard and Leslie. He even suggests that Penny get back together with Leonard. Penny comes back with her date and sees Leonard and Leslie. Both Penny and Leonard try to make each other jealous by making out with their respective partners. In the end, Leslie breaks up with Leonard because he supports Sheldon's String Theory over Leslie's Loop Quantum Gravity.

Episode 03: The Barbarian Sublimation
Penny feels frustrated by her failure at everything in her life. She becomes obsessed with playing an online game called "The Age of Conan," and Sheldon tries to help with her addiction by giving her tips on how to get to the next level. She calls him at work for help. When she crosses the boundary by going into Sheldon's room in the middle of the night, he's had enough. Leonard tries to get through to her but fails. Sheldon sets up an online dating profile for her and brings home a guy for her to meet that's supposed to be her perfect match. Penny is so far into the game that she doesn't even notice. Only when Wolowitz propositions her does she snap out of it.

Episode 04: The Griffin Equivalency
Koothrappali is being honored by People Magazine's "30 under 30" for his discovery of a new planet. The guys all try to express their support and happiness for him except for Sheldon who can't understand why he's being honored for discovering something that already exists. As Raj gets cockier and cockier about it, Leonard and Wolowitz have a harder time being supportive and try to avoid him. Raj invites them all to a party the magazine is throwing for the honorees but they all decline coming. He invites Penny as his date and she accepts. He ends up getting really drunk in order to hang out with her.

Episode 05: The Euclid Alternative
Leonard needs to work nights, leaving Sheldon without a ride to or from work. He asks Penny, then Wolowitz, then Koothrappali, but one way or another, he manages to annoy them to the point they won't drive him. Their answer is to stage an intervention -- convincing Sheldon to get his driver's license. The first hurdle is the learner's permit test; Sheldon thinks the questions are poorly phrased, and the DMV clerk is so annoyed with him, she hands him a permit. Since no one is willing to drive with him, they set up a simulator so he can practice driving. It's a disaster and clearly Sheldon isn't cut out to drive.

Episode 06: The Cooper-Nowitzki Theorem
After speaking at a student seminar, Sheldon finds himself with a groupie named Ramona Nowitzki. She’s young and beautiful and prepared to do anything for Sheldon so he can focus entirely on his work. Leonard, Penny, Wolowitz and Koothrappali are stymied by Ramona’s attentions, especially when they seem to cross professional boundaries. As they try to figure out what Sheldon’s “deal” is, Sheldon appears to be initially charmed by the attention. However, when it gets to be too much, Sheldon has no idea how to extricate himself from the situation.

Episode 07: The Panty Pinata Polarization
Penny is now a member of Leonard and Sheldon's group, so she must obey the house rules. After her third strike, Sheldon banishes her. Leonard gets frustrated with Sheldon about this because he and Penny are in a good friendly place with their relationship, but Sheldon is adamant. Leonard goes to Penny and asks her to apologize to Sheldon in order to make peace. She tells Leonard he’s enabling Sheldon and she won’t participate in that. Unfortunately this leads to a war between Sheldon and Penny with things escalating to the point where Sheldon steals Penny’s laundry. Finally, Leonard goes to Penny and gives her Sheldon’s kryptonite -– his mother’s phone number. She uses it, Sheldon apologizes and all is well. Also, Wolowitz learns about the show America’s Next Top Model and becomes obsessed with finding America’s Next Top Model house.

Episode 08: The Lizard-Spock Expansion
Leonard, Sheldon and Koothrappali are using Rock-Paper-Scissors-Lizard-Spock to decide what to watch on TV when they're interrupted by a phone call from Wolowitz. Wolowitz has picked up a woman, Stephanie, by telling her he can let her drive the Mars Rover; unfortunately, he drives it into a ditch and needs help. Leonard escorts Stephanie home, while Sheldon and Koothrappali help Wolowicz. Leonard and Stephanie end up making out in the car and start dating. Wolowitz is furious until they invite him on a double date with Stephanie's roommate.

Episode 09: The White Asparagus Triangulation
Leonard continues to date Stephanie and things seem to be going well as far as he's concerned. Sheldon, however, is worried that Leonard isn't handling things correctly; Sheldon really likes Stephanie and it's extremely important to him that Leonard's relationship go well.  At first he seeks Penny's perspective on Leonard's relationship deficiencies, then orchestrates things to make Leonard seem more manly.  When this backfires, he decides to hack Leonard's Facebook page, and change Leonard's relationship status to "in a relationship." Leonard's furious that Sheldon has forced him into the cyber-equivalent of saying "I love you" first, but when Stephanie reciprocates, all ends well.

Episode 10: The Vartabedian Conundrum
Penny councils Leonard about his relationship with Stephanie when he realizes that the only reason he is dating her is that she likes him. He tries to break it off, but each time he tries they end up having sex. Finally he breaks up with her by text message.

Episode 11: The Bath Item Gift Hypothesis
Leonard meets his intellectual superior in award winning scientist David Underhill. Underhill is the total opposite of Leonard: handsome, charming, and cool. He's the whole package of brains and looks which initially doesn't sit well with Leonard. Although when Hill asks for Leornard's help in research he is undertaking, he happily jumps at the offer. Leonard's joy of working with Hill is hampered by jealousy when Underhill takes an interest in Penny and the feelings are reciprocated.
Sheldon, having always viewed the holidays as a pagan ritual that is rooted in obligations rather than holiday cheer, is taken for a loop when Penny brings him a Christmas gift. He now feels obligated to buy her a gift and enlists Wolowitz and Koothrappali to help him with this task which they reluctantly agree to. Sheldon believes he has come up with the most logical gift giving scenario until he opens Penny's gift; he cannot believe what she got him.

Episode 12: The Killer Robot Instability
The guys are excited about building a “killer” robot named Monte for a regional robot fighting league when Kripke challenges them to a robot duel which Sheldon jumps at. The duel goes awry and Monte is the causality. Penny finally tells Wolowitz what she thinks of his crude behavior toward women and he is devastated by her comments; Leonard convinces her to go apologize. Just as she starts to sympathize, Wolowitz once again misreads the signs and Penny has a violent reaction.

Episode 13: The Friendship Algorithm
Sheldon needs to use a new super computer that has just arrived at the University but when Leonard informs him that Kripke controls who can use the computer and he only allows his friends to use it, Sheldon makes it his mission to befriend Kripke. The guys are skepitical if Sheldon can do it since they point out that he has never made any effort to befriend anyone in his life; not even them. Sheldon surmises that he must take a scientific approach to friendship. He figures out, what he feels, is a fool proof "friendship" algorithm. Kripke agrees to meet with Sheldon and things seem to be going well until Sheldon asks Kripke to use the computer. Kripke turns Sheldon down and Sheldon inquires as to why since they are now friends. Kripke informs him that he has no control over who uses the computer and all Sheldon has to do is sign up for the official schedule. Sheldon realizes all this research was for nothing and immediately dumps Kripke as a friend.

Episode 14: The Financial Permeability
When Penny runs into financial trouble, Sheldon gladly offers to lend her money. Penny is uncomfortable with taking money from him and begins to act out her frustration which confuses Sheldon entirely. Leonard soon finds out that her financial troubles began when she lent money to her ex-boyfriend, Kurt, who has never paid her back. Without Penny's knowledge, Leonard then decides to get the guys together to confront Kurt and get her money back. It doesn't go exactly as Leonard plans but soon enough Penny's ex shows up at her door and returns the money. Penny is so taken by Kurt's gesture that she believes he has changed his ways and agrees to go out on a date with him to Leonard’s dismay.

Episode 15: The Maternal Capacitance
Leonard’s mother, a brilliant neuroscientist who has no concept of appropriate human interaction or warmth, comes for a visit. During her stay, she manages to alienate and cause emotional turmoil in everyone’s lives except for Sheldon who is taken by her since they are so much alike. Leonard is not in the least happy with her presence and Penny feels likewise after his mother makes Penny explore and question her relationship with her father; both Penny and Leonard turn to each other and a bottle of tequila for comfort which leads them to explore much more than their individual childhood issues.

Episode 16: The Cushion Saturation
Wolowitz begins to date Leslie with Leonard’s blessing. Leslie has access to unrestricted grant money that she is using towards Wolowitz's research while the other guys are having their budgets cut. Wolowitz soon realizes that Leslie intends to have a relationship of convenience with no real feelings involved and Wolowitz questions if he is okay with the idea of being used as a sex object; but only for a minute. Meanwhile, Penny accidentally ruins Sheldon’s “spot” on the couch; Sheldon’s neurosis hits a new level when he tries out different areas in the apartment to find a new spot with no success.

Episode 17: The Terminator Decoupling
The guys are going to attend a symposium featuring Dr. George Smoot (Nobel Laureate for his work on the Big Bang) in San Francisco. Sheldon decides for the group that the train is the best way to travel and while initially the other three were not thrilled, their mood soon changes when they realize Summer Glau, "The Terminator", is on the train with them. Koothrappali, Wolowitz and Leonard argue about who will hit on her first. Koothrappli decides he should get some alcohol in him since he knows he is unable to hit on women sober. As Wolowitz is about to make his move, Koothrappali swoops in and in his seemingly drunken state, charms Summer to Wolowitz's dismay.
Sheldon forgets his flash drive at home which contains a research paper he planned to present to Dr. Smoot at the symposium. He initially wants to turn back to get the flash drive but Leonard convinces him to call Penny since she has the key to their apartment. Sheldon reluctantly agrees and allows Penny access to one place no woman has ever been; his bedroom.   

Episode 18: The Work Song Nanocluster
Sheldon helps Penny start her own business making hair clips.  Leonard and the rest of the guys pitch in to start a website and manufacture her goods. The website is pretty lame -- and they are tease Leonard about it. In the mean time Sheldon has his first cup of coffee and he is bouncing off the walls. The gang has to make 1000 Penny Blossoms over night for an order that ships the very next day.

Episode 19: The Dead Hooker Juxtaposition
Penny has become one of the guys around our guys. She dresses in sweats -- hair in a pony tail -- and she is not at all prepared when a new, very hot girl moves into the building. Leonard, Koothrapali and Wolowitz go crazy for this girl. They do everything for her, and it drives Penny crazy. She tries to compete with this girl, but she is just the new flavor - and they pay no attention to Penny. The episode culminates with the new girl getting a part on CSI -- and when she doesn't need the guys anymore, she dumps them. This episode ends with Penny and the new girl getting in a knock down, drag out CHICK FIGHT!

Episode 20: The Hofstadter Isotope
In this episode Penny is hit on by the sales clerk in a comic book store that the guys frequent. Leonard is devastated at this turn of events. He can't believe that Penny would date one of "them" if it isn't him. In the mean time, Sheldon gets in the middle of the budding romance by constantly challenging the new guy to engage in a Batman dialogue. The new guy is such a nerd, that he falls right into Sheldon's hands. Penny ends up asleep on the couch while the guys hash it out over what Robin's real name is.  

Episode 21:  The Vegas Renormalization
When Wolowitz is dumped by Leslie Winkle, the guys take him to Vegas. He hides in his room the whole time looking at Leslie's Facebook page. The guys finally lure him out with a prostitute. In the mean time, Sheldon stays back home and gets locked out of his apartment. He ends up spending the night at Penny's place.

Episode 22:  The Classified Materials Turbulence
Stuart the comic book sales clerk goes to Leonard to ask his advice on dating Penny. Leonard advises him to act very shy around Penny. Leonard later finds out that Stuart's date with Penny goes all wrong because while making out, Penny calls out Leonard's name. In the mean time, Wolowitz has designed a toilet for the International Space Station, and has left out one of the most important parts. All the guys rally around to try to find a fix for the space toilet.

Episode 23: The Monopolar Expedition
Sheldon is approached by the Dean of the University to lead a scientific expedition to the Arctic. He invites the guys to go along with him for the summer and be his team. After much banter about how difficult it would be to spend a whole summer in such tight quarters with Sheldon, they decide it is too good of a career opportunity to pass up. When Penny hears the news, she knits a cap and scarf for Leonard. He is not sure how to take this, as he still has feelings for her and wonders if this may mean that she has unspoken feelings for him.  He decides to ask her what the meaning was behind the gift, and she tells him she will miss him. He questions if that is all that she wants to say. Although she is tentative in her response, it is clear that they have a special connection. The show and season end with all of the guys, including Leonard, in a hut in the Arctic.


information from: cbs.com
image adapted from: photobucket

waterlilybarb

Episode 01: The Electric Can Opener Fluctuation
The guys get back from the North Pole and tell Sheldon they altered his research in an effort to put him in a better mood for the duration of the trip. Sheldon is humiliated because he already notified his colleagues at the university of his successful expedition. Devastated, he resigns from the university and runs back home to Texas and his mother. The guys go after him in an effort to convince him to come back with them.
Penny is so excited to see Leonard back from the trip that she immediately drags him into her apartment, kissing him incessantly. Both soon realize that being "friends with benefits" is not necessarily a natural fit for them.

Episode 02: The Jiminy Conjecture
Leonard admits to the guys that sex with Penny was not all it was cracked up to be. He tells them in confidence that it was just "fine." While hanging out later as a group, Sheldon spills the beans, and poor Penny feels awful. Leonard tries to make up with her and they talk about why it is so weird between them. They decide they need to have a drink and loosen up a little bit. In the mean time, Sheldon and Howard make a bet regarding the type of cricket they hear chirping in the building. Once they find the cricket in question, they take it to the university etymologist played by Louis Black. Howard wins the bet and takes possession of one of Sheldon’s prize comic books. Penny and Leonard get a little too loose, and both end up getting sick, leaving their new intimate relationship in an even weirder place.

Episode 03: The Gothowitz Deviation
Wolowitz meets a Goth girl online. When she asks to meet at a local Goth club, Wolowitz takes on his own Goth persona in order to impress the girl. Wolowitz and Koothrappali go to the club to meet her and her friend. The girl seems into Wolowitz and suggests they go get tattoos together. Wolowitz, thinking he is going to score, agrees to go. But all goes bust when Wolowitz chickens out of getting a real tattoo.
Sheldon is trying to use positive reinforcement to train Penny to behave how he likes. Leonard catches on and initially is appalled by it, telling Sheldon to stop. But when Leonard sees how well it works, he decides to use it on Penny to achieve his own objectives. Penny catches on and gives Leonard a little negative reinforcement.

Episode 04: The Pirate Solution
Koothrappali reveals to the guys that he will soon be deported since the university will no longer fund his research and he is here on a work visa. Wolowitz, devastated by the news, tries to find Koothrappali a new job. Koothrappali 's interview is initally going well until he is introduced to his new team member, a beautiful female scientist. He then takes a couple of shots of sherry to loosen himself up and ends up hitting on the beutiful scientist and blowing the interview. Sheldon comes up with the idea that Koothrappali can come work for him. At first, Koothrappali prefers deportation but soon reconsiders. When Koothrappali begins to question Sheldon's research methods, Sheldon fires him just as Koothrappali quits.

Episode 05: The Creepy Candy Coating Corollary
Koothrappali wants Sheldon to be his partner in a card tournament because Sheldon can count cards. Koothrappali hears that Wil Wheaton will be in tournament and is very excited while Sheldon is not. He tells Koothrappali a sad story of how when he was young he made his way a long distance to meet Wil Wheaton and Wil did not show up to the event which devastated Sheldon and made him forever hate Wil Wheaton. Sheldon meets up with Wil Wheaton in the finals. Wil is not understanding why Sheldon hates him and Sheldon finally tells him his sad story. Wil tells Sheldon that was the year his grandmother died and Sheldon has sympathy for this and begins to tell Wil how he understands and how much he loves his “Mee Maw” too. Sheldon begins to feel bad for Wil and ends up throwing the match and letting Wil win only to find out Will made up the whole grandmother story.
Wolowitz reminds Leonard of a pact they once made that if any of them every managed to get a hot girlfriend they need to have the hot girlfriend hook up the guys with her hot friends. Penny who reluctantly agrees and they are going to have a double date. The date is going horrible until the girl makes a comment of how awful her mother is. They start to tell “mommy dearest” stories and find themselves bonding over their mutual hatred for their mothers.

Episode 06: The Cornhusker Vortex
Penny is having a football watching party and initially does not invite Leonard. Leonard thinks its less about his lack of football knowledge and more about Penny being embarrased to introduce him to her friends. Penny reassures Leonard that is not the case and invites him to watch next week's game with her friends. We find out that Sheldon is a football savant and knows everything about the game. Leonard enlists his help and asks Sheldon to come to the party to feed him football facts in order to impress Penny and her friends. It back fires on Leonard when Sheldon takes over as the hit of the party.

Episode 07: The Guitarist Amplification
Penny and Leonard have a huge fight after Penny tells him that a male musician friend of hers, who she dated for a short time, is coming to stay with her while he is in town. Leonard is enormously bothered by this and can’t understand why Penny thinks it is fine. They begin to argue and we find out that Sheldon cannot take hearing people argue. Apparently Sheldon heard his parents argue all the time and it traumatized him. Koothrappali and Wolowitz then take sides and begin to argue about who is right in the fight between Penny and Leonard. Sheldon can’t handle anymore fighting so he takes refuge in the comic book store where Penny and Leonard have to convince him that they are done fighting in order to get Sheldon to come home.

Episode 08: The Adhesive Duck Deficiency
Leonard, Koothrappali and Wolowitz head to the desert to see the Leonids meteor shower. While camping, Wolowitz starts hitting on a few girls, gets nowhere but they give him some cookies to get him away. The guys eat the cookies and soon realize they received an extra ingredient they didn't expect. The guys sit around the campfire, high off their cookies, when Wolowitz reveals how he lost his virginity to his second cousin. Initially this doesn't register with Leonard and Koothrappali in their altered state but this information is not soon forgotten by either. The guys get the munchies and in their feeding frenzy, forget all about the meteor shower.
Penny falls in the shower and Sheldon comes to her aide. The awkwardness of finding her naked is not lost on either but Penny is really hurt and Sheldon must now drive her to the hospital. As Sheldon goes through his pre-driving ritual, Penny tries to keep her cool but he finally manages to get her to the hospital. After the hospital, Sheldon takes her back to her apartment and Penny requests that he now sing her "Soft Kitty". Penny tells Sheldon how much she cares for him and how happy they are friends. He is visibly uncomfortable but appreciates what she is saying.

Episode 09: The Vengeance Formulation
Wolowitz gets nervous about committing to Bernadette and begins to pull away from her. When he realizes he has made a mistake, he goes overboard and proposes to her. She is shocked by this over the top gesture. Wolowitz realizes he went overboard and apologizes; Bernadette accepts. Wolowitz decides a verbal apology is not sufficient and procedes to sit down at a piano and sing Bernadette an apology to tune of the Four Tops song "Bernadette". While Penny is horrified, Bernadette thinks it is sweet since no one has ever sung to her before.
Kripke plays a prank on Sheldon during his interview with Ira Flatow. Sheldon vows revenge and devises the ultimate prank to get back at Kripke. The prank works, but unfortunately for Sheldon, the President of the university and the board members are caught in the mix.

Episode 10: The Gorilla Experiment
Penny feels left out of all the science talk now that Bernadette is part of the gang. She enlists Sheldon to teach her about physics. In the mean time, Wolowitz gets irrationally jealous when Bernadette shows interest in Leonard's work. Wolowitz lets Leonard know that he better stay away from his "girlfriend." When Bernadette gets wind of Howard's jealousy, she threatens to break up with him. He apologizes and realizes there is no harm done. Back at Sheldon and Leonard's apartment Penny struggles to learn the basics of physics form Sheldon. Penny surprises everyone at the end of the episode when she rattles off a monologue about what Leonard is working on.

Episode 11: The Maternal Congruence
Leonard's mother, Beverly, returns for a visit and Leonard is less than excited. Penny finds out that Leonard hasn't told Beverly they are in a relationship and she tries to find the right moment to give Beverly the news. Beverly informs Leonard that she and Leonard's father are getting a divorce after she discovered he cheated on her but Beverly seems un-phased by the situation. Penny gets Beverly to open up after stopping at a bar where they bond over shots of tequila. Penny finally tells Beverly about her and Leonard's relationship and she seems to take it well in her own over-analytical way. In her drunken haze, she plants a huge kiss on Sheldon but realizes she would prefer the busboy at the bar. Beverly and Leonard come to a new understanding about how they need to include one another in their lives more and Penny is thrilled that Beverly, even after naming off a list of Penny's shortcomings, thinks she is adorable.  

Episode 12: The Psychic Vortex
Penny and Leonard get into a big blow up over the fact that Penny visited a psychic and actually believes what the psychic told her. Leonard ends up apologizing and actually agrees to meet Penny's psychic. Bernadette and Wolowitz continue to date and are getting along swimmingly. In the mean time, Raj is feeling really left out, because he is the only one without a girlfriend. He bribes Sheldon to go to a mixer with him down at the University where they meet two really cute girls and one of the girls really likes Sheldon. They all go back to Sheldon and Leonard's apartment, and as Raj gets cozy with one of the girls, the other girl, Martha, suggests to Sheldon that she "tuck him in." This goes right over Sheldon's head and he totally rejects her advances and just replies, "Oh thanks, but the only person who tucks me in is my mother."

Episode 13: The Bozeman Reaction
Sheldon and Leonard's apartment is broken into and Sheldon decides to install a home security system that goes all wrong and ends up ensnaring Penny in a net. Sheldon is so nervous about another break in, he won't leave Penny and Leonard alone, and insists on sleeping in their room with them. In the end, he decides to move to Bozeman, the safest city in the country. Unfortunately, when he arrives, he is immediately robbed at the train station, so he buys a one-way ticket back to Pasadena.  

Episode 14: The Einstein Approximation
Sheldon is suffering from “Theorist’s block” and cannot complete a formula he has been working on for sometime. Taking inspiration from Einstein, who discovered the theory of special relativity while working in a patent office, Sheldon takes a menial job busing tables at the local Cheesecake factory in an attempt to jump start his brilliance. He was never actually hired at the Cheesecake Factory but decides to just to start working in an effort to clear his block. Penny tries to stop him but Sheldon is doing surprisingly well and even serves the guys' a meal. Sheldon finally achieves the great breakthrough he is looking for- it comes in the form of a broken dish.

Episode 15: The Large Hadron Collision
Leonard is invited to Switzerland on Valentine's Day to see the CERN Supercollider, the world's largest and highest-energy particle accelerator, and Sheldon is shocked when Leonard decides to take Penny, making it a romantic Valentine's Day present, instead of him. Sheldon tries several angles in an effort to change Leonard’s mind including guilting Penny into not going, but Leonard isn’t budging and tells Sheldon that he would rather go alone than take him. Unfortunately for Leonard, Penny gets sick the night before they have to leave so Leonard decides to make peace and invite Sheldon to go. When Leonard gets to the apartment, he finds Sheldon is horribly sick too. Penny and Sheldon end up staying home sick together and Leonard is forced to take Koothrappali to Switzerland for what was supposed to be a romantic getaway.

Episode 16: The Excelsior Acquisition
Sheldon is summoned to traffic court after getting a ticket for running a red light while taking Penny to the hospital (episode #308) and misses meeting Stan Lee, creator of Spiderman, at the comic book store. While in court Sheldon insults the judge and ends up in jail for contempt. He threatens to never forgive Penny for ruining his one and only opportunity to meet the great Stan Lee. Penny feels horrible and goes to the comic book store to ask Stuart for Stan Lee's phone number. Stuart is so smitten with Penny, that he actually gives her Stan Lee's home address. Penny takes Sheldon to Stan Lee's house but Stan Lee has Sheldon arrested...again.  

Episode 17: The Precious Fragmentation
In a parody of "The Lord of the Rings," the guys fight over a ring they believe was an original prop from the movie. Leonard wants to give the ring back to its original owner. Koothrappali wants to sell it so that he can get a jet ski. Sheldon wants to keep it so badly that he actually starts to turn into Gollum from the Lord Of The Rings movies. Sheldon sneaks into Penny and Leonard's room in the middle of the night to steal the ring off of Penny's neck where she is wearing it to keep it safe, and Penny punches him in the nose. In the end Leonard sends the ring back to New Zealand to the original owner. However, in the tag we see that Leonard has lied about sending it back to New Zealand, and has really hidden it in his room.  

Episode 18: The Pants Alternative
Sheldon finds out he is being honored with a prestigious award by the University and suddenly gets stage freight and wants to decline the award just so he won't have to stand in front of his colleagues and give a speech. Penny wants to help Sheldon regain his confidence and enlists the guys to help her do it. She convinces Sheldon to allow them to help by comparing them to the "X-Men" team, which Sheldon gets in to and calls his team the "C-Men," which the guys hate. Penny takes Sheldon to buy a professional suit, while Leonard and Koothrappali try to provide psychological and spiritual guidance without much success. On the night of the event, Sheldon initially appears composed but soon his nerves get the best of him and as he is about to be introduced to the stage, he wants to run out. Penny gives him the only thing she knows will calm him down and get him through this speech - alcohol, and lots of it.

Episode 19: The Wheaton Recurrence
Leonard tells Penny he loves her but she replies with "thank you" which was not the response that Leonard was looking for. Leonard is hurt and Penny feels him pulling away and explains to him that she has said "I love you" too early in a relationship and the outcome wasn't good so she didn't want to rush into it and ruin what they have.
Sheldon, Penny and the guys meet up with Stuart's team at the bowling alley but Stuart has a surprise replacement for a regular teammate - Wil Wheaton. Sheldon thinks this is his moment to take his revenge but Penny and Leonard get into a fight while bowling and both storm off making Sheldon forfeit the game to Wil's delight. Sheldon facilitates Leonard and Penny's reconciliation solely for the reason that he needs both to play a rematch game with Wil Wheaton and his team. The game is pretty close and Wil hones in on Penny's insecurities about saying "I love you" to Leonard, essentially playing mind games, in order to throw off her game. His tactic works and Penny runs off yelling at Leonard and Sheldon must forfeit to Wil once again. But Sheldon vows he will get his revenge.  

Episode 20: The Spaghetti Catalyst
Sheldon tries to hide from Leonard that he is still "seeing" Penny. When Penny runs into Sheldon in the hallway and he expresses to her that he would like to remain friends, even though she and Leonard are no longer "coitusing," Penny is pleasantly surprised at Sheldon's overture, and invites him to dinner. Sheldon then feels compelled to hide his continued friendship with Penny form Leonard. In doing so, he eats dinner and home with the guys, and then pretends he is going for a walk and sneaks over to Penny's for another dinner. Finally the lying breaks him down, and he tells Leonard that he is still "seeing” Penny. Leonard does not mind. Penny and Leonard embark on a divorced-parent-like relationship with Sheldon. At the end of the episode, they agree that they can be friends.

Episode 21: The Plimpton Stimulation
When Sheldon meets a famous female physicist online, and invites her to come visit and stay at his apartment, Leonard quickly realizes that it is the famous and very attractive female physicist that he has a big thing for. It turns out that she is interested in Leonard, and pays him a visit to his room in the middle of the night. The next day penny gets wind of this, and criticizes Leonard for jumping into bed with someone else so quickly. And Sheldon feels betrayed because Leonard is "playing with HIS friend."  It turned out that this woman played by Judy Greer is a bit of a hussy, and comes on to all the guys, culminating in a hilarious scene where she proposes a foursome. The boys back out.

Episode 22: The Staircase Implementation
In this episode we trace the history of Sheldon and Leonard and the guys. Penny asks Leonard why he ever moved in with Sheldon, and through flashbacks we learn the whole genesis of their friendship. It started 7 years ago when Leonard was simply looking for a roommate. Sheldon had advertised at the University, and Leonard went to the apartment to meet him. Upon arriving there, he met the old roommate, who told him to "run for you life!" In the apartment Leonard saw that the old roommate has scrawled "Die Sheldon, Die" on the walls. This is where we learn about the roommate agreement, and how Howard and Raj came into the fold. In the end, we find out that Sheldon actually saved all of their lives, by putting an experiment that Leonard was doing in the elevator, and shutting the doors, thereby making sure that Leonard was not near the explosion.

Episode 23: The Lunar Excitation
Raj and Howard sign Sheldon up for online dating, and find the perfect woman for him. She is the female version of Sheldon. Penny shows up at Leonard's door, drunk and lonely, and takes him straight into the bedroom. Leonard wakes up the next morning overjoyed until he finds out that Penny regrets the drunken encounter. Leonard decided he is going to try the same approach, and goes to the home of Leslie Winkle. he attempts to have casual sex with her, and she shuts the door in his face.  

descriptions from: CBS
image adapted from: photobucket

waterlilybarb

Episode 1: The Robotic Manipulation
Sheldon has been communicating with Amy Farrah Fowler for the past few months via text messages. Penny convinces Sheldon he should go on a date with her after he informs the group that he and Amy are going to procreate. Penny learns that this is Sheldon's first date EVER. Sheldon gets Penny to drive him and Amy around on their date. Penny tries repeatedly to break the awkward silence with no luck until she points out to Amy that this is Sheldon's first date. Sheldon and Amy discuss the topic and then Sheldon points out the rather large number of men that have come in and out of Penny's life.
Wolowitz creates a robotic hand which he shows off to the guys. While Wolowitz tests out different commands on the robot he realizes that the hand has a very realistic feel. Wolowitz gets into a very compromising position when the robot hand freezes up on a very personal area. Leonard and Koothrappali must take him to the hospital since neither are willing to volunteer to help Wolowitz free himself from the robots grip.

Episode 02: The Cruciferous Vegetable Amplification
­Determined to live long enough for the moment when man and machine become one, Sheldon decides he must cease all physical contact with the outside world. Using a computer screen and basic robot technology, he winds up alienating the entire gang in the process. Sheldon wants to avoid his friends due to his consuming too many gas producing vegatables. So he creates a computer screen version of himself that has wheels and is controlled by robotics. He winds up joining that gang at the Cheescake Factory where they see the one and only Steve Wozniak sitting near by. Shelbot approaches him, and Wozniak compliments his machine. ­

Episode 03: The Zazzy Substitution
­After having a major disagreement about whose work is more important, Sheldon and Amy Farrah Fowler decide to end their relationship. As a means of coping, Sheldon begins to acquire cats for companionship. When the number of cats reaches 25, Leonard steps in and brings in the big guns – Sheldon’s mother. Laurie Metcalf guest stars again as Sheldon's mother, Mary. She flies in from Texas to help Sheldon get out of his funk over Amy. She calls a meeting, inviting Amy, where she points out that Amy is all worng for Sheldon. Sheldon automatically rejects his mother's opinion, and suggests to Amy that they restart their relationship. Amy agrees, and Shedlon's mother has won by using reverse psychology. ­

Episode 06: The Irish Pub Formulation
­Koothrappali’s sister, Priya, comes for a visit and we find out she and Leonard have a romantic past unbeknownst to the rest of the guys because Leonard and Howard made a pact to never make a move on her. When Sheldon discovers Leonard sneaking Priya out of the apartment the next morning, Leonard bribes him with the promise of having a train day if Sheldon will keep the secret. Sheldon agrees but is terrible at keeping secrets so he instead comes up with an elaborate story of how Leonard met an Irish bartendar at Pasadena's best Irish pub. Leonard tells Sheldon that the story isn't necessary and that if he just keeps his mouth shut, everything will be okay.
When the guys gather the next day, after Koothrappli has taken Priya to the airport, Leonard feels so guilty about what he did that he immediately starts telling the story that Sheldon concoted for him. The truth comes out and both Raj and Howard feel betrayed. This starts an argument with all of them which in turn reveals secrets they've all been keeping from each other.

Episode 07: The Apology Insufficency
­Leonard is still depressed about being alone but thinks his problem with women stems from the fact that he lacks confidence. He vows that the next time he meets a woman who he thinks is attractive, he will stand up full of self-assurance. Meanwhile Wolowitz is being considered for the team for the new Defense Department surveillance satellite. Because it's top secret, he tells the guys that the FBI might be calling them to ask questions about Howard. Koothrapali is hesitant about talking to the FBI as he fears they might deport him, even though he's in the country legally. When an attractive female FBI agent arrives at his door, he has to think fast about how he's going to talk to her because he realizes he has no alcohol in the house. Thankfully he finds a rum cake in the fridge. The agent then shows up at Leonard's lab to ask questions about Howard and he takes advantage of the situation, exudes his confidence and asks her out. Lastly, the agent speaks with Sheldon who has no interest in talking about Howard but accidentally tells her how he crashed the Mars Rover while attempting to impress a woman. When the Defense Department takes Howard off the team, Sheldon feels so guilty that, as an apology, he gives Howard his seat on the couch. Howard accepts the apology and the seat, but when the gang gathers at Leonard's and Sheldon's, Sheldon can't stand the new arrangement and takes his seat back. ­

Episode 08: The 21-Second Excitation
­The guys are very excited about going to a screening of Indiana Jones and Raiders of the Lost Ark because there are 21 seconds of additional footage being seen for the first time. When they arrive to wait in line, they're concerned about how far back in line they are and how they might not get inside. Sheldon blames the other three for various reasons as to why they didn't get there sooner. Wil Wheaton shows up and taunts the guys. He and his friends are treated like VIPs and bypass the entire line to get seats inside. When they finally let everyone in, the guys miss getting into the screening by two people and Sheldon is convinced that it's because of Wil Wheaton. Resolved that if he doesn't get to see the movie neither does Wil Wheaton, Sheldon steals the film reels and runs with the angry audience chasing after him and the other guys.
Meanwhile, Penny, Bernadette and Amy have a girls' night. They play truth or dare and Amy asks Penny that if she and Leonard are no longer dating, why does she continue to spend so much time with him? She also wants the truthful answer of how Penny would feel if Leonard started seeing another girl. Uncomfortable, Penny goes to her room where Amy tries to comfort her in her strange way.

Episode 09: The Boyfriend Complexity
­When Penny's dad comes to visit, Leonard discovers that she told her parents they were back together because Leonard was always their favorite boyfriend of hers. Leonard takes full advantage and plays his boyfriend role to the hilt to Penny's dismay. Raj is disappointed when Bernadette shows up during his and Howard's quality time but they end up bonding more than Howard would like which forces him to put a stop to it in a very awkward way.

Episode 10: The Alien Parasite Hypothesis
­While out at dinner with Penny and Bernadette, Amy Farrah Fowler meets Zack, Penny's ex-boyfriend. Much to her surprise, she finds herself flushed with an elevated heart rate and a tingling sensation. She and Sheldon discuss her symptons and she discovers that she was sexually aroused. Uncertain of what to do, Sheldon asks Penny for advice and convinces him that indeed there is something Sheldon can do for a horny Amy Farrah Fowler. He accompanies Amy to a bar where she propositions Zack but when Zack is utterly confused by the language she uses, Amy decides to abandon her assignment. When Zack shakes her hand to say goodbye, she gets what she needed and tells Sheldon she can move on.
Meanwhile, Howard and Raj argue over who would be the superhero and who would be the sidekick between the two of them. Much to Leonard's annoyance, they decide to settle the matter with a wrestling match that seems to go on forever since neither one will make the first move.

Episode 11: The Justice League Recombination
­Penny is dating Zack again and becomes upset when the guys make fun of him, making him feel stupid. When they go over to Penny's to apologize to him, they realize he can help them out with the New Year's costume competition at the comic book store and offer to make him Superman in their Justice League. Unhappy that he's been usurped, Leonard calls dibs on being The Green Lantern which forces Koothrappali, much to his dismay, to dress up as Aquaman. Zack signs Penny up to be Wonder Woman but she refuses to wear the dark wig. When Zack sides with the guys that she should wear it, she gets upset and tells the guys she's not going to the party at all. After failed attempts by Zack and Sheldon, Leonard goes over to Penny's to try and make amends and get her to come with them. They share a nice moment and at the party, the gang ends up winning the costume contest. ­

Episode 12:  The Bus Pants Utilization
Leonard comes up with a great idea for an phone app and the guys all pitch in to help. When Sheldon becomes too controlling, Leonard fires him. Penny finds Sheldon by himself in the hall, she invites him to work with her on an app of their own. Quickly annoyed with him, Penny begs the guys to take Sheldon back. When they refuse, she convinces Sheldon to practice his sarcasm and apologize to Leonard so he can work with them again.

Episode 13: The Love Car Displacement
The gang goes on a road trip to Big Sur where the guys, Bernadette and Amy are speaking at a symposium. Penny tags along as Amy's plus one for the free spa weekend that's promised. When Wolowitz meets Bernadette's hulk of an ex-boyfriend, he becomes really insecure and they have a fight, throwing the hotel room arrangements into chaos. Rick Fox guest stars in this on as Bernadette's ex boyfriend.

Episode 14: The Thespian Catalyst
Sheldon has agreed to take part in a short lecture series at the university. After completing his first lecture, he is shocked to find out just how much the students hate him as a teacher. Amy tells him that teaching is a performing art and suggests to Sheldon that perhaps her best friend, Penny, could share some of her acting skills with Sheldon to make him a better teacher and learn to connect with his audience better. Sheldon goes to Penny and asks her to give him some acting lessons. Sheldon doesn't take Penny's direction well and is an awful actor yet he thinks he is a brilliant playwright and improvizationalist and decides to use his newfound skills on his students.
Koothrappali is feeling down about not having a girlfriend and Bernadette reasures him that someone as great and cute as him will not stay single for long. Soon Koothrappali realizes he ha as crush on Bernadette and we see several daydreams with he and Bernadette. The final one ending in a Bollywood style musical number.

Episode 15: The Benefactor Factor
An incredibly wealthy older woman is considering making a huge donation to the school's science program.  When she takes a liking to Leonard, Sheldon attempts to pimp Leonard out in the name of science. Jessica Walter guest stars as the older woman that wants Leonard. Josh Molina guest stars as the president of the University. Leonard swears that he will not sleep with her just for the money. But in the end he succumbs to her seduction.  

Episode 16: The Cohabitation Formulation
­Wolowitz and Bernadette are in a great spot in their relationship but he never stays over because he always has to run home to help his mom out in the morning. Bernadette wants them to move in together but Wolowitz can't see the two of them living with his mother working out so well. Finally, Bernadette has enough and gives him an ultimatum - her or his mother. Howard chooses Bernadette and shows up at her door all ready to move in. Unfortunately, what Bernadette quickly discovers is that Howard didn't quite leave his mother behind - he just replaced her with Bernadette! He expects her to make him dinner, take him to the dentist and do everything his mother does. When she calls him on it, Howard thinks she's being ridiculous and hightails it back to his mother's.
­ Meanwhile, Priya, Raj's sister is back in town and reunites with Leonard, even though Raj forbids it. Penny meets Priya, and Amy Farrah-Fowler, as a witness to all of this, offers her shoulder for Penny to cry on as she understands how hard it must be to know Penny's been replaced by a much better and more suitable mate for Leonard. At first, Penny feigns indifference but eventually she breaks down, much to Amy's delight as she can use Penny and continue her study of how intense crying and emotions are triggered in the brain.

Episode 17: The Toast Derivation
­With Leonard dating Priya and Priya staying with her brother, Raj, the gang starts hanging out at Raj's place, much to Sheldon's disbelief. Amy Farrah Fowler helps with him the startling realization that it is Leonard who is the social center of their group and not Sheldon. Undeterred, Sheldon decides to create his own social group at his apartment and invites over Barry Kripke, Zack, Penny's ex, Stuart, the comic book store owner and Levar Burton, from TV's Reading Rainbow. Barry, Zack and Stuart all show up for various reasons of their own but Stuart and Barry soon become enamored with Zack's stories of getting girls and Sheldon quickly abandons them.
Meanwhile, the gang is hanging out a Raj's having chili con carne, laughing about what Sheldon would say if he was there. They soon discover that they actually miss his presence. Sheldon soon shows up, having left his newly formed group and says everything they all thought he would say. This time, though, rather than being annoyed, the gang encourages his criticism.
Amy and Bernadette kidnap Penny for a girls' night out to help her get over Leonard and his new relationship with Priya. Initially Penny is resistant to meeting anyone, but after Amy's incessant prodding, Penny decides that a one night stand may be just the thing for her.

Episode 18: The Prestidigitation Approximation
­Wolowitz drives Sheldon crazy as he tries to figure out Howard's magic trick. It seems to work as Howard does it for Raj and Penny and Sheldon spends the rest of the episode coming up with various ways to successfully do the trick himself but to no avail. In the end, we find out that Raj and Penny are in on the joke and Howard's magic trick is simply just a trick on Sheldon - because it's too fun for them when they drive him nuts.
Meanwhile, Priya tells Leonard that she feels uncomfortable with the amount of time that Penny spends hanging around him. She asks him to talk to Penny to let her know that they can't hang out together. Leonard attempts to tell Penny several times but can't seem to get the words out even though he tells Priya that Penny totally understood about the situation and will stay away from them. He's caught in his lie when Penny sees him and Priya out to dinner and tries to join them to kill time before meeting the rest of the gang out for a movie. In the end, Penny figures out what's going on and ends their friendship for him.

Episode 19: The Zarnecki Incursion
­Leonard comes home to find an upset Sheldon talking to a police officer in the living room. Sheldon goes on and on about how they stole everything. We learn that Sheldon's World of Warcraft account has been hacked and the character that he has spent years working on has been cleaned out. Essentially, identity theft of his online persona. Penny drops by to console Sheldon but runs into Priya and awkwardly leaves. Priya, bored watching the guys play the game, decides to leave as well.
Hanging out later, the girls decide they no longer like Priya.
Wolowitz manages to find out who took Sheldon's stuff, and even has the guy's address down in San Diego. They make bold plans to go on a real-life adventure and travel to the thief's house that evening. Leonard is worried about blowing off Priya two nights in a row, but is sure she'll understand.
After many delays in getting there, the guys are confronted by a huge nerdy teenager and get scared. The confrontation is a complete failure. On the way back home, Leonard's car breaks down and they call Penny to pick them up. When she finds out that they never got Sheldon's stuff back, she turns the car around, insisting she show them how they finish things in Nebraska. When the guy answers the door, Penny says "Give my friend his stuff back," knees him, takes him down and the guy agrees to give everything back. Sheldon (who did nothing) : "WE DID IT!"

Episode 20: The Herb Garden Germination
­During a book reading, Amy tells Sheldon a piece of juicy gossip she heard where Bernadette is thinking about breaking up with Howard. Sheldon, in turn, shares with Leonard, who shares it with Priya who tells Leonard that it would be good news for Raj. He happens to have a crush on Bernadette. Leonard tells Penny about Raj's crush.
Later that day, in the cafeteria, Wolowitz, shares with the guys that he's thinking about asking Bernadette to marry him. That night, Sheldon tells Amy the news from Howard. The two of them decide to see how gossip moves through a social group. They plan to fabricate one juicy piece of gossip and a second, non-juicy piece, to use as a control.
Immediately, Amy seeks out Penny and tells her that she and Sheldon had intercourse! At the same time, she also tells her she's thinking of starting an herb garden.
When Penny runs into Raj later at the Cheesecake Factory, she sees him flirting with Bernadette and admonishes him for it. To get his mind off her, Penny shares the gossip about Sheldon and Amy. Back at the apartment, Leonard hints to Sheldon about what he heard. Sheldon realizes their false gossip appears to be spreading really fast. When the gang gets together for dinner, Wolowitz prepares to ask Bernadette to marry him but she jumps in by saying yes, surprising everyone.
­ Still unsatisfied, Amy later passes along two new bits of fake gossip to Penny: She's carrying Sheldon's child and she's taking bowling lessons.

Episode 21: The Agreement Dissection
­Sheldon and Priya knock heads when she uses her lawyer skills to pick apart the roommate agreement. Frustrated, Sheldon goes out and ends up spending a girls' night with Penny, Bernadette and Amy. ­

Episode 22: The Wildebeest Implementation
­After Leonard & Priya invited Howard & Bernadette to dinner, Amy & Bernadette devise a plan for Bernadette to act as a spy on Leonard & Priya and to also talk about all the awesome things Penny is doing now.
After the dinner begins, Penny is quickly swept up in the drama when Bernadette reports that Priya has made a comment about her acting career. Amy and Penny start texting false information for Bernadette to disseminate, like Penny just got a part in an Angelina Jolie movie and info on who Penny is dating now. Eventually Bernadette can't take the stress of keeping the lies going, cracks under the pressure and abruptly leaves the dinner early. Wolowitz points out it was still way less weird than spending a night with Amy and Sheldon.
While that dinner is going on, Koothrappali finds himself alone and sad and goes to Sheldon's to hang out. While they chat, he eventually reveals he has a new experimental beta blocker from the university's pharmaceutical school which could help him speak to women. In the spirit of science, Sheldon encourages him to take it. They eventually go to a coffee shop to test the results. Koothrappali strikes up a very smooth conversation with a cute girl, but the beta blocker is ultimately too effective and lowers his fears to a point where he gets completely naked in the coffee shop.

Episode 23: The Engagement Reaction
­Bernadette and Mrs. Wolowitz have a “get-to-know-ya” lunch at a deli. Howard hopes that once his mom sees how wonderful Bernadette is, she’ll welcome her into the family like a daughter and he’ll be able to finally tell her about the engagement. When his mother returns and heads into the bathroom, Howard takes the opportunity to tell her they're getting married. The news is met with silence.
We later learn that Howard was eventually able to knock down the bathroom door, pick up his unconscious mother and drive her to the emergency room. The gang all go to check on Howard and his mom at the hospital. Howard is convinced that the news of his impending marriage caused his mother to have a heart attack, or a “heart-attack-like-event” as the doctor put it. Bernadette is now convinced that Howard’s mother hates her.
At the hospital, Sheldon is paranoid he will contract an infectious disease and while trying to avoid it, he accidentally walks into an isolation room and is thus exposed to an infectious disease.
Penny and Priya go off in search of good coffee and end up bonding with each other through stories of Leonard's prowess in bed. In the end, it turns out that Mrs. Wolowitz was just suffering from food poisoning and Bernadette was the first person she wanted to see to make sure she was okay. Bernadette gets mad at Howard for making her believe she caused his mother's heart attack.

descriptions & image from: CBS & tv.com

waterlilybarb

Episode 1: The Skank Reflex Analysis
The series picks up hours after the season finale where Penny emerges from Leonard's room, with Raj right behind her, saying "This isn't what it looks like." Sheldon is working through her cryptic statement and trying to figure out what it actually WAS. Annoyed, Leonard finally tells him that it was exactly what it looked like - Penny and Raj slept together. When the four boys reunite in the cafeteria, tensions run high as Leonard is upset with Raj and doesn't understand how he could do that to him. When Raj confesses that he and Penny are in love, Leonard scoffs and tells him that he was in love with Bernadette just months before. Howard is shocked at hearing this and the three boys start arguing. Sheldon tries to get them to discuss more important matters, like the upcoming paintball tournament. Meanwhile, Penny is distraught over sleeping with Raj and Amy comes over to comfort her. Penny can't take being in the apartment anymore and goes to More...stay with Amy. Penny starts questioning her entire life. Everything sucks. She’s ruined things with friends. Her acting career sucks – she can’t even get the hemorrhoid commercial she auditioned for last week. Koothrappali comes over to Amy’s to ask Penny out. She breaks it to him what they did was a huge mistake. Penny says she just wants everything the way it used to be. He reveals they actually didn’t have sex in the conventional sense…he tried to put the condom on and she tried to help him but nothing more happened after that. He still thinks it was a beautiful experience but asks her not to tell anyone about it because he’s a bit embarrassed. She reluctantly agrees. The guys are at the paint ball game but Leonard, Raj and Howard are too upset with each to even care about playing. Sheldon takes it upon himself to inspire his troops and commits "suicide" but running out into the game without his gun. The three guys, inspiried by his matrydom, run out to avenge Sheldon's death. Back at the apartment, Penny joins the guys who've basically forgiven each other. She tells them she's decided to move back to Nebraska because her life in California hasn't amounted to anything. While Leonard tries to convince her otherwise, Penny gets a call from her agent, informing her that she booked the hemmorhoid commercial. Penny, inspired again, abandons the idea of leaving. The guys are left with their friend still living across the hall and Raj bragging about how he slept with her.

Episode 2: The Infestation Hypothesis
Priya returns to India but Leonard and her agree to try a long distance relationship. The video chat daily and Leonard, trying to keep the spark alive, convinces Priya to try virtual sex which Leonard is not very good at. He gives it a last try, undressing in front of his monitor, talking dirty to Priya but soon Leonard realizes Priya is not the one on the other end of the video chat - it's her parents. Leonard annoyed at Leonard video chatting with Priya heads to Penny's apartment and is happy to find a new comfortable chair. When Penny tells him she found it on the street he is horrified to think of all the germs that have infested it and that are now on his body - he demands for Penny to get rid of it but she refuses. Sheldon enlists Amy's help to convince Penny to throw away the chair while Sheldon is freaking out that he has lice crawling all over his body. Amy gives it a try but Penny catches on to Sheldon's game and tells Amy to leave.  Amy fearing she is about to lose her "bestie" takes back everything she just said and tells Penny she loves the chair. Amy sits down on it and both are shocked when a rat that was hiding in the chair jumps out to bit Amy. Penny begs Amy to never tell Sheldon what happened.

Episode 3: The Pulled Groin Extrapolation
­With Bernadette, Howard and Raj going to the movies, Penny going to work and Sheldon getting a ride from one of those groups to the train store, Leonard finds himself alone in the apartment with Amy. At first, Leonard is ill at ease with Amy being there, but soon, he grows comfortable with her presence and her contendedness to just sit. Sheldon returns from the train store to find Amy still in the apartment. She tells him that she's rescinding her invitation to accompany her to a wedding that weekend and instead, Leonard is going to be her date. Meanwhile, Bernadette gets a surprise when Howard talks about how the two of them are going to move in with his mother once they're married. They get into a fight but he soon convinces her to just spend the weekend with them to try it out. Bernadette agrees and soon Howard discovers that he might be marrying a too-close-for-comfort version of his mother. At the wedding, Amy takes Leonard to task for always being a sad sack. She convinces him to dance with her and he finally agrees. They have a great time and Leonard gets so enthusiastic that he tries to do the splits, thus straining his groin. It doesn't damper his good time and at the end of the night, Leonard thanks Amy and kisses her on the cheek. Amy immediately goes to Penny and tells that she unwittingly made Leonard fall in love with her. When Leonard tells Sheldon that he and Amy had a good time and she's a lot of fun, Sheldon immediately karate chops Leonard in the neck, exclaiming, "She's not for you!" Sheldon gets territorial. About a girl.

Episode 4: The Wiggly Finger Catalyst
Penny sets Raj up with a deaf girlfriend of hers, solving his problem of talking in front of a woman, and Raj falls for her instantly. He showers her with lavish gifts until his parents soon cut him off and Raj discovers love is not enough for her when she dumps him.

Episode 5: The Russian Rocket Reaction
Sheldon and Leonard run into Wil Wheaton at the comic book store. Wil invites them to a housewarming party. Leonard says he’s actually thinking of going. Sheldon tells Leonard he would be betraying his trust and friendship if he went because Wil Wheaton is one of Sheldon’s mortal enemies. Sheldon further explains that, until Leonard makes a decision about the party, Sheldon is simultaneously his friend and NOT his friend. Sheldon calls this phenomenon, "Schrodinger’s Friendship.” Wolowitz shows up at Leonard and Sheldon’s apartment with big news: He’s going to be an astronaut! Well, sort of. NASA picked his team’s design for a piece of equipment that will be installed on the International Space Station. Someone has to go up with the equipment as a Mission Specialist and as it stands, Wolowitz is the standby backup. Bernadette expresses her concern – going into space is dangerous, plus Wolowitz would have to take an old Russian, Soyuz rocket to get to the space station. Later, Wolowitz is upset that he doesn’t have Bernadette’s support for his big dream. Once the guys get to Wil Wheaton’s party, Wil has a surprise for Sheldon. He gives him an autographed, one sixty-fourth scale mint-in-package Wesley Crusher action figure. He even wrote, "To Sheldon, sorry this took so long. Your friend, Wil Wheaton.” Sheldon is so excited that he shows the box to Brent Spiner. Unfortunately for Sheldon, Brent Spiner rips the package open. This immediately lands Brent on Sheldon’s list of mortal enemies.

Episode 6: The Rhinitis Revelation
Sheldon's mother, Mary, comes to visit and the entire gang loves spending time with her, much to Sheldon's chagrin. He refuses to believe it's jealousy but, when he comes down with the common cold like a "common man", he's gleeful that mommy is there to take care of him and sing him "Soft Kitty."

Episode 7: The Good Guy Fluctuation
­Leonard meets a really cool girl, Alice, in the comic book store who immediately expresses an interest in him. The more time he spends with her, the more conflicted he feels about his relationship with Priya. In the end, he confesses to Priya that all he and Alice did was kiss and it will never happen again but Priya tells him she also messed up by sleeping with her ex-boyfriend. They both agree that perhaps the long-distance thing isn't working out so well. In honor of Halloween, the guys pull pranks on Sheldon throughout the episde. He tries to retaliate but they always seem one step ahead.

Episode 8: The Isolation Permutation
Amy is heartbroken when she learns Penny and Bernadette went to look at bridesmaids dresses without her. Sheldon is having trouble getting in contact with Amy, so Leonard drives him over to check on her. They find Amy sadly playing "Everybody Hurts” on the harp. Amy explains that she’s sad because Penny and Bernadette went shopping for bridesmaid’s dresses without her. Sheldon asks her what he can do to help and she says, "comfort me.” She then tells him she craves human intimacy and physical contact. When Sheldon reminds her that theirs is a "relationship of the mind,” Amy suggests that maybe one night of passion might blot the pain. Sheldon instead offers to stroke her head for five minutes or until she falls asleep – whichever happens first. Wolowitz tells Penny and Bernadette what happened with Amy and they tell him that Amy has just been taking her bridesmaid duties to an extreme but go to apologize -- Amy doesn't accept. Later, Amy .calls Sheldon drunk and Sheldon blames Leonard for Amy's behavior since he brought Penny into the group. In the end, Bernadette tells Amy she wants her to be her made of honor and Amy enthusiantically accepts, taking out her video camera to capture the moment.

Episode 9: The Ornithophobia Diffusion
­Leonard and Penny try to hang out alone as friends for the first time since they broke up. Sheldon's phobias are put to the test when a bird camps out on the living room window sill.

Episode 10: The Flaming Spittoon Acquisition
­When Stuart asks Amy out on a date, Sheldon finds himself jealous. Everyone is shocked when Sheldon officially asks her to be his girlfriend.

Episode 11: The Speckerman Recurrence ­
When Leonard is contacted by a former high school bully through Facebook, he cringes at the memories. The former classmate is going through some rough times and reaches out to Leonard, not realizing that he had made Leonard’s life hell. Leonard agrees to meet with his former bully and the guys decide to accompany him for support. When Leonard confronts him about how mean he was, the guy feels badly and goes into a depression, making Leonard feel guilty. In the meantime, Amy and Bernadette help Penny choose a philanthropic endeavor.

Episode 12: The Shiny Trinket Maneuver
Amy gets professional recognition and Sheldon, in his self-centered way, couldn't care less. Penny, Koothrappali and Leonard go about trying to make Sheldon a better boyfriend by getting him to realize that sometimes in a relationship you need to pretend to care - even when you really don't. At the same time, Wolowitz and Bernadette realize they need to discuss their feelings about children, after Howard performs a magic show at his nephew's birthday party with Bernie as his assistant. We learn Bernadette can't stand being around kids.

Episode 13: The Recombination Hypothesis
­Leonard decides to ask Penny out on a date, and they both agree to give their relationship another chance. They argue over dinner and remember why they didn't work in the first place, but they end up sleeping together afterwards anyway. They agree to secretly continue seeing each other under the condition that they act like friends around everyone else, just so that they can make sure the relationship works. Eventually it is revealed that this is just a fantasy for Leonard, but it does inspire him to actually ask Penny out. She agrees to go to dinner with him, and their relationship begins anew.

Episode 14: The Beta Test Initiation
Leonard and Penny decide to put their relationship through a 'beta test,' which allows them to report the problems they have with each other as 'bugs,' like a programmer would do with computer software. When they exchange lengthy lists of relationship bugs, Leonard takes it to heart and decides to take Penny to on a real date to a gun range, where he promptly shoots himself in the foot. Meanwhile, Koothrappali buys an iPhone 4s from the mall and falls in love with Siri. Wolowitz and Bernadette become concerned when he starts treating his phone like a real woman. Sheldon and Amy try to achieve internet fame by creating "Sheldon Cooper Presents: Fun with Flags," a video podcast dedicated to the study of flags.

Episode 15: The Rothman Disintegration
Sheldon and Kripke argue over who should get Professor Rothman's vacated corner office, so Leonard, Koothrappali, and Wolowitz devise a contest for them which awards the office to the winner. Unfortunately, the contest centers around a subject which Sheldon and Kripke are equally terrible: sports. Meanwhile, Amy buys Penny a garish painting as a gift to celebrate their friendship, but Penny hates it. She and Bernadette struggle to come up with ideas for how to discreetly dispose of the painting.

Episode 16: The Werewolf Transformation
­Sheldon's routine world is turned upside down when he learns that his longtime barber passed away, so he tries to act like a hippy to match his new shaggy hairstyle. Meanwhile, Wolowitz is sent to Houston for the grueling NASA training program, and he shares his horrific stories with Bernadette via Skype.

Episode 17: The Rothman Disintegration
Sheldon and Kripke argue over who should get Professor Rothman's vacated corner office, so Leonard, Koothrappali, and Wolowitz devise a contest for them which awards the office to the winner. Unfortunately, the contest centers around a subject which Sheldon and Kripke are equally terrible: sports. Meanwhile, Amy buys Penny a garish painting as a gift to celebrate their friendship, but Penny hates it. She and Bernadette struggle to come up with ideas for how to discreetly dispose of the painting.

Episode 18: The Werewolf Transformation
Sheldon's routine world is turned upside down when he learns that his longtime barber passed away, so he tries to act like a hippy to match his new shaggy hairstyle. Meanwhile, Wolowitz is sent to Houston for the grueling NASA training program, and he shares his horrific stories with Bernadette via Skype.

Episode 19: The Weekend Vortex
Amy gets upset with Sheldon when he breaks his promise to accompany her to her aunt's birthday party and instead opts to join the guys for a weekend-long Star Wars game marathon. After a very lopsided game of quarters, a drunk Penny convinces her to confront Sheldon about it, and he eventually apologizes.

Episode 20: The Transporter Malfunction
Penny gives Sheldon and Leonard collectible Star Trek action figures as payback for all the food she has mooched from them over the years. Sheldon and Leonard agree not to open the figures to preserve their value, but Sheldon can't resist the urge to play with his and accidentally breaks it. He then switches his figure with Leonard's figure, and let's Leonard and Penny believe that the dealer she bought the figures from ripped her off. Meanwhile, Koothrappali asks his parents to arrange a marriage for him since he can't find love, but his arranged wife turns out to be a lesbian.

Episode 21: The Hawking Excitation
When Stephen Hawking comes to lecture at the university for a week, Wolowitz is given the enviable task of maintaining his wheelchair. Sheldon begs Wolowitz to introduce him to Hawking, but Wolowitz only agrees after making Sheldon do a few humiliating tasks, including doing his laundry, cleaning his room, and taking his mother dress shopping.

Episode 22: The Stag Convergence
Leonard, Sheldon, and Koothrappali throw a classy bachelor party for Wolowitz, and Koothrappali accidentally lets slip stories about Wolowitz' perverse sexual history. When Bernadette learns about this, she gets upset and threatens to call off the wedding, but Wolowitz gives a convincing and heartfelt apology that wins her over.

Episode 23: The Launch Acceleration
When NASA informs an extremely nervous Wolowitz that he's being moved up to an earlier launch, he tries to use the wedding as an excuse not to go into space. However, the fact that he's an astronaut is the only thing Bernadette's father likes about him, so he reluctantly agrees to the earlier mission. Meanwhile, Amy tries to get Sheldon to take the next step in their relationship by overwhelming him with things he loves, thinking the attachments he's made to his favorite things might transfer over to her. Sheldon doesn't like what she's trying to do, but he can't deny that it's very effective. Penny finally agrees to sleep with Leonard again, but he accidentally asks her to marry him in the middle of the act and she freaks out. Her ultimate answer is no, but their relationship is largely unaffected.

Episode 24: The Countdown Reflection
Wolowitz and his fellow astronauts sit in the space shuttle awaiting launch, the story of Bernadette and Wolowitz' wedding is told via flashback. Bernadette decides that she wants to marry Wolowitz before he launches into space, so they try to do a quick wedding ceremony at City Hall. When that plan doesn't work out, their friends all become ordained ministers online and hold a rooftop ceremony that is captured via the Google Earth satellite. Season five comes to a close with Wolowitz screaming as he's launched into space, with his friends and new bride watching on their tv at home.

descriptions from: CBS
image source: tvdb

waterlilybarb

Episode 1: The Date Night Variable
Howard is still in space, but he’s able to connect with the group on earth via webcam. During a call with Bernadette, he’s caught in an argument between his wife and his mother over the topic of where he’ll live when he gets back. Meanwhile, Raj is feeling very lonely while Wolowitz is away, so he tries to tag along with the two other couples (Sheldon/Amy & Penny/Leonard). Sheldon invites him to go out to dinner with Amy and himself, but neglects to tell him that it’s a dinner for their two year anniversary. Amy is completely annoyed that Raj is there until she reveals this to him, and then, being Mr. Romantic, he creates a phenomenal dinner experience for them. When he gets booted out of their date, he crashes Penny and Leonard’s date and that goes all wrong when he tells Penny she should just tell Leonard she loves him once and for all. Later, Raj talks with Stuart from the comic book store, who is the only guy more lonely that he is. They bond and Stuart becomes Koothrappali’s new best friend.

Episode 2: The Decoupling Fluctuation
Penny confesses that something is wrong with her relationship with Leonard to the girls, but she’s not sure what it is and feels like she might need to break up with him. While at the movies with the group, Amy tells Sheldon that Penny wants to break up with Leonard, but makes him promise not to say anything. Later, Sheldon goes to Penny to privately encourage her not to break up with Leonard. By the end of the episode, Penny has made up her mind to break up with Leonard, but his jubilant reaction to her preface ("You know I love you..”) catches her off guard and she can’t go through with it.

Episode 3: The Higgs Boson Observation
Sheldon hires an assistant named Alex, an attractive female grad student. Amy gets incredibly jealous of Sheldon having a female assistant, but it turns out that Alex is actually more interested in Leonard. Penny doesn’t quite know what to do, since this does make her a tad jealous, so she "marks her territory” by sleeping with Leonard. Meanwhile, Wolowitz’ return from space has been delayed a week and he starts to lose his mind because of it. He’ll eventually make it back to earth in #604 and they’ll deal with the ramifications of things that have changed in his absence.

Episode 4: The Re-Entry Minimization
Wolowitz returns from space but doesn’t receive the praise and glory he expected from his friends and family. It starts when he comes through baggage claim at LAX, where Bernadette is waiting for him. People around start screaming, "Howie! Howie!”, but they’re actually yelling for Howie Mandel, who was on his flight. Later, Wolowitz agrees to spend the night alone with Bernadette, but she comes down with a nasty cold, takes Benadryl, and passes out on him. He pays an early visit to his mother, who he finds in the midst of a tryst with his dentist, Dr. Schneider. After that, he visits Koothrappali and learns that Stuart has essentially taken his place as Koothrappali’s best friend. Meanwhile, Sheldon, Amy, Leonard, and Penny decide to have a group game night, which gets ultra-competitive when Sheldon starts losing at Pictionary. The foursome goes through a variety of games, including wrestling, Where’s Waldo, and more, before finishing with a pie eating contest. Wolowitz walks in just as the foursome are neck-deep in pie and competition is fiercest, and they yell, "Get out!” at him so they can focus on the contest. At the end of the episode, a very lonely and distraught Wolowitz goes to have a piece of cake at a diner by himself, but his mood improves drastically when the waitress recognizes him as an astronaut.

Episode 5: The Holographic Excitation
In a Halloween themed episode, Sheldon and Amy disagree over ideas for a couples costume for the party Stuart and Koothrappali are hosting at the comic book store. In the end, they compromise, going as Raggedy Ann and Raggedy C3PO. Wolowitz is back from space and won't stop talking about it, which drives his wife and all of his friends crazy. Bernadette confronts him about it and he gets dejected, feeling that everyone is belittling the greatest accomplishment of his life. If he stops talking about space, he's worried he'll just be plain old Howard Wolowitz. Bernadette tells him that regular Wolowitz is perfect for her. Meanwhile, Penny goes to visit Leonard at his lab and ultimately gets turned on by watching him work, resulting in them having sex almost every time he starts talking about science around her.

Episode 6: The Extract Obliteration
Sheldon gets excited when Stephen Hawking agrees to play him in a game of Words With Friends. However, when Sheldon starts to beat him badly, Hawking sulks and stops playing. Taking advice from Wolowitz, Sheldon throws the game and Hawking immediately beats him and starts gloating. Meanwhile, Penny enrolls in a class at Pasadena Community College but doesn't want to tell Leonard about it. When she does, he rewrites one of her papers without her consent, leaving her furious with him.

Episode 7: The Habitation Configuration
Amy and Wil Wheaton get into a fight while filming a new episode of Fun With Flags, and Amy gets upset with Sheldon for not defending her. Confused, Sheldon goes to Penny for advice, gets drunk on Long Island Ice Teas, and then drunkenly confronts Wil and demands an apology. Meanwhile, Bernadette wants Wolowitz to completely move out of his mother's house, but when she learns how much his mother depends on him, she can't let him go through with it.

Episode 8: The 43 Peculiarity
The guys realize that Sheldon disappears for 20 minutes every day shortly after lunch, so they set out to figure out what he’s doing in that time. They trail him to a secret room where the number 43 is written on a whiteboard, then exhaust themselves trying to figure out what it could possibly be. Later, it's revealed that Sheldon uses the 20 minutes to mentally decompress by playing hackey sack. Leonard gets jealous when Penny starts texting a British guy in her class, so he tries to scare the guy off. Penny eventually tells him she loves him, which calms him down, but then Sheldon's assistant Alex starts flirting with him.

Episode 9: The Parking Spot Escalation
Sheldon gets upset when his unused parking spot in a prime location at the university is reassigned to Wolowitz. He simply can’t swallow the idea that someone feels Wolowitz is more important than he is, and Wolowitz sees no reason that the spot shouldn’t be his, given that Sheldon doesn’t drive. What follows is a war of escalation between Sheldon and Wolowitz, where they each "steal” things the other holds dear because they "weren’t using it at the time.” As the girls talk over the issues between their significant others, Amy and Bernadette wind up getting drawn into the fight by proxy and become accomplices to the men. Eventually, their feud escalates to a point where Sheldon and Wolowitz start to realize how stupid it is, and Sheldon agrees to let Wolowitz use his spot, provided the space still has Sheldon’s name on it. Despite the guys reaching an agreement, Bernadette and Amy have not, and the episode ends with them staring daggers at one another over dinner.

Episode 10: The Fish Guts Displacement
Sheldon is forced to take care of Amy when she gets sick, thanks to a special clause he built into their Relationship Agreement. He begrudgingly takes care of Amy, who loves the extra attention so much that she continues to pretend to be sick even after she’s gotten healthy. When Sheldon finally discovers that she’s healthy, he tells her that his father would’ve spanked him for the ruse she pulled – an idea that excites Amy greatly. Meanwhile, Howard is forced to go over to his in-laws for dinner, where Bernadette volunteers him to go on a fishing trip with her macho father. Howard has no clue how to fish, so he enlists Penny to give him a tutorial about being ‘manly.’ Howard eventually stands up to Bernadette’s father and tells him he doesn’t want to go fishing, and the two of them decide to go to a casino instead.

Episode 11: The Santa Simulation
Leonard tries to get Sheldon to warm up to the idea of Christmas by playing a Christmas-themed Dungeons & Dragons game. As the game progresses, Sheldon has an opportunity to save Christmas by saving the (fictional) life of Santa Claus, but he chooses not to because he holds a grudge against the bearded Christmas icon. In doing so, he reveals that he’s hated Santa Claus ever since he was 8 years old, when he asked Santa Claus to bring his father back to him and Santa failed. In the end, the revelation (and fictional death of Santa) gives Sheldon some closure. Meanwhile, Koothrappali’s character gets killed off in the D&D game early on, so he goes out with the girls on a girls’ night and bonds with them. He reveals that he had a crush on both Penny and Bernadette, but not on Amy, so she spends all night flirting with him only to let him down at the end.

Episode 12: The Egg Salad Equivalency
Sheldon’s assistant, Alex, flirts with Leonard a little more openly, and he finally picks up on it. Leonard is intrigued by the prospect of being liked by two women at the same time, but he has no feelings for Alex whatsoever; he just likes the attention. When he discusses how to handle this issue with the guys, Sheldon immediately voices his displeasure with the scenario, feeling that Alex should focus on his work alone. Sheldon covertly tries to get advice from Penny, Amy, and Bernadette about what to do, but Penny figures out that he’s referring to Leonard and Alex and gets irritated. Sheldon tries to talk to Alex about it directly, but his suggestions come across as completely inappropriate and wind up getting him sent to Human Resources. While there, he dishes out dirt on some of the inappropriate things the other guys have done in the past, and they all get in trouble. In the end, Sheldon is forced to take an online sexual harassment course, and Leonard smoothes things over with Penny.

Episode 13: The Bakersfield Expedition
The guys decide to go to the Bakersfield ComicCon, but on the way, they opt to stop for some photos at the Vasquez Rocks, which is where many of the most famous episodes of Star Trek were filmed. Once there, they get distracted taking photos in their Star Trek costumes and someone steals their car, along with all their cell phones and everything inside it. They are forced to walk to the nearest diner, where they can call the police and a ride home. On the walk, they discuss the fact that they’re all grown men now, and that it might be time to move past their fixation on comic books and fantasy lore. Meanwhile, Penny, Amy, and Bernadette discuss their boyfriends’ fixation on comic books over dinner, and they decide that they should read one to see what all the fuss is about. They go to see Stuart at the comic book store, who is absolutely stunned to have women in his shop, and they eventually decide to read a comic about Thor because "he’s hot.” After reading it, the girls decide they don’t like it, but wind up getting in an argument over Thor’s hammer. To solve it, they start researching other comic book lore and wind up getting sucked into the fantasy world their boyfriend’s love so dearly. The guys arrive back home from their excursion, set on moving on from comic books, only to find their girlfriends in the midst of a heated comic book argument that they can’t possibly stay out of.

Episode 14: The Cooper/Kripke Inversion
Sheldon is outraged when he learns that the university is forcing him to work with Kripke on a potentially groundbreaking new project. His self-esteem takes a hit when he and Kripke exchange work and he discovers that Kripke's work is leaps and bounds ahead of his own. Fortunately, Kripke thinks Sheldon's work is suffering because he is constantly having sex with Amy, and Sheldon decides to go along with the lie to save face. Later, when Penny and Leonard confront Sheldon about it, he admits that he might actually sleep with Amy... one day. Meanwhile, Koothrappali and Wolowitz order personalized action figures in their likeness, but the figures they get look nothing like them at all. Determined to get their action figures, they decide to split the cost of a very expensive 3D printer to make their own figures. The printer works like a charm, but Bernadette gets upset when she learns how much Wolowitz spent and makes him get a refund.

Episode 15: The Spoiler Alert Segmentation
Leonard gets upset with Sheldon when he spoils the ending of one of the Harry Potter books for him, so he storms over to Penny’s place to cool off. While there, he broaches the subject of moving in with Penny, which she isn’t ready for and can’t articulate properly. Unable to properly convey her feelings to Leonard, he plans on moving in, which gives Amy the opportunity to move in with Sheldon. Penny and Sheldon talk the apartment situation over and discover they're both against having their significant others move in, so decide they have to be honest about their feelings. When Sheldon talks to Amy, he winds up selling Penny out, saying that it’s all her fault because she doesn’t want Leonard to move in. Amy confronts Penny and Leonard overhears it, forcing Penny to tell him she's not ready to take that step with him yet. Meanwhile, Wolowitz is going to Vegas with Bernadette, so he asks Koothrappali to keep an eye on his mother, since she’s dealing with a break-up with her lover, the dentist. Wolowitz’ mother puts a big guilt trip on him and forces him to stay, to the point where he has to try and sneak out of the house to get away.

Episode 16: The Tangible Affection Proof
It's Valentine's Day and Leonard wants to give Penny a night full of fun and romance, despite her not being the biggest fan of the holiday. He takes her to a fancy restaurant with Bernadette and Wolowitz, but things take a turn for the worse when Penny sees her ex-boyfriend propose to the girl he cheated on her with. Thinking quickly, Leonard tries to propose to Penny, but she doesn't want to hear it. After arguing with Leonard and leaving the restaurant, they make up when Leonard vows to never to propose again, instead letting Penny be the once to propose if and when the time is right. Meanwhile, Amy tells Sheldon that she wants to celebrate Valentine's Day, and that she's found the perfect gift for him. Distressed and annoyed at being forced to celebrate a holiday he hates, Sheldon tells his assistant, Alex, to find the perfect gift for Amy. When Alex's suggestions don't satisfy him, he winds up making Amy his emergency contact at work, which she loves. Amy, in return, gives Sheldon nothing, which is exactly what he wanted, as well. Since Koothrappalli and Stuart are without Valentines, they throw a singles' party at the comic book store and it turns out to be a success.

Episode 17: The Monster Isolation
This episode picks up where episode #616 left off, with Koothrappali on his date with Lucy from the comic book store. Much to his dismay, Lucy runs away during the middle of the date, shattering his confidence. Leonard, Wolowitz, and Bernadette try to pull him out of his slump, but it’s no use. Luckily, Wolowitz runs into Lucy at the comic book store, where she gives him her phone number to give to Koothrappali. When they finally talk to one another, Lucy apologizes for running off, saying that she’s incredibly shy and damaged, but she really does like him and agrees to go on another date. Meanwhile, Sheldon enlists Penny’s help for a new episode of Fun With Flags, and she winds up giving him useful acting tips. Impressed, he actually compliments Penny on her acting ability, which means a lot to her. Later, the gang goes to see her perform in "A Streetcar Named Desire” and she blows them all away with her performance.

Episode 18: The Contractual Obligation Implementation
Sheldon, Wolowitz, and Leonard are forced to volunteer on a committee for the university, but Sheldon hates nearly all of them and doesn’t want to put forth any extra effort. They wind up joining a committee that encourages women to get involved in the sciences and go to speak at Wolowitz's old middle school. The guys have problems relaying their passion for science to the school girls, so Sheldon calls Bernadette and Amy, who give a rousing speech to the attendees via phone. Koothrappali has been texting Lucy nonstop, since texting makes him less nervous and he comes off as more charming. He decides to take her to a library, where they can text back and forth instead of talking, and the date goes very well. Meanwhile, Penny, Amy, and Bernadette play hooky from work to get princess makeovers at Disneyland.

Episode 19: The Closet Reconfiguration
Bernadette & Wolowitz host a dinner party, but Sheldon brings take-out Thai food out of habit since the party fell on his Thai food night. As punishment for being rude, they make Sheldon organize Wolowitz’ extremely cluttered closet, and he finds an unread letter addressed to Wolowitz from Wolowitz’ father when he was 18 years old. After much debating, Wolowitz opts to not read the letter and burns it instead. Later, Bernadette, Amy, and Penny want to hear what the letter said, so they try to convince Sheldon to recite it to them, since he read it as he was cleaning. Sheldon winds up revealing the contents of the letter to everyone but Wolowitz, which infuriates him. Later, everyone offers to recite a different rendition of the letter, including the real one, and then let Wolowitz pick the one he prefers the most. Touched by the heartfelt renditions his friends provided, Wolowitz opts not to choose, and instead focuses on the happy memory they all helped him create.

Episode 20: The Tenure Turbulence
The guys learn that a professor has died at the university, meaning that a position on the tenure track has opened up. Sheldon, Leonard, Koothrappali, and Kripke are all viable candidates for the position, so they get into a bit of a competition. They learn that Ms. Davies in HR is on the tenure committee, so they all try to impress her to gain an advantage, but they wind up offending and irritating her. Finally, the whole group goes to a mixer, where they argue with one another over who deserves tenure the most. In the end, Ms. Davies recommends all three of them, despite their quirks, because they are all very accomplished in their fields.

Episode 21: The Closure Alternative
Sheldon is furious when he finds out that the SyFy series Alphas was cancelled after its cliffhanger second series finale, preventing him from getting much-needed closure. Amy brings up the idea of reconditioning his brain to not feel compelled to seek closure for everything with a variety of fun exercises. As they progress through the exercises, Sheldon gets more and more anxious, but eventually lies to Amy and says that he’s cured. After she leaves, he races to complete all of the tasks that she prevented him from completing earlier in the night. Meanwhile, Koothrappali discovers that his new girlfriend, Lucy, has a blog and that she’s written about him. Much to his dismay, she’s mentioned that he’s very feminine, which makes him worry about their relationship. When she comes over for date night, he overcompensates and tries to appear super masculine. Lucy eventually confronts him and he fesses up, and she swears that she likes his feminine traits.

Episode 22: The Proton Resurgence
Sheldon gets excited when he learns that his favorite TV science personality, Professor Proton, is able to be booked for private parties. He decides to book Proton, who eventually comes to the apartment for a private show with Leonard, Sheldon, and Penny. While there, Proton tells them his tale of woe: how he hoped to be a real scientist, but he wound up going the public television route and lived a very sad and depressing life. Sheldon produces a signed photo from Proton that he kept from his childhood years as inspiration, hoping that he can return the favor by inspiring Proton to follow his real dream of becoming a true scientist. Meanwhile, Koothrappali is assigned to a project at work for the weekend, so he asks Wolowitz and Bernadette to watch his dog, Cinnamon. While they go for a pleasant stroll with the dog, Wolowitz and Bernadette discuss the idea of having kids, which they both seem to enjoy, but things quickly go south when they lose Cinnamon. They lie to Koothrappali as they try to find her, but he catches them in their lie after a good Samaritan finds the dog and returns her to Raj. He confronts them about lying to him, but Bernadette manages to turn the tables on him and prove, in Wolowitz’ mind, that she’ll be a great mother.

Episode 23: The Love Spell Potential
The girls get excited about a trip to Vegas, and the guys use the opportunity to have a Dungeons & Dragons night. However, when the girls’ trip gets derailed after a snafu with airport security, they return to the apartment and wind up joining the D&D game. After some drinks, Penny lets it slip that Sheldon could see himself getting physically intimate with Amy in the future, but Sheldon denies it and says he’s not ready yet. Amy gets upset and goes to hide in Sheldon’s bedroom, where he follows and they have a heart to heart. Sheldon reaffirms that he’s not ready for that level of intimacy yet, but he could be in the future, so they end up doing a bit of verbal role playing behind closed doors. Meanwhile, Koothrappali and Lucy go on a date, and he encourages her to step further outside her comfort zone by sending food that she ordered back to the kitchen. Lucy gets uncomfortable and tries to sneak out the bathroom window again, but she gets stuck in a locked alleyway and is forced to call Koothrappali for help. Koothrappali can’t get the gate unlocked, but they do talk things over, and it results in them kissing for the first time – through the fence.

Episode 24: The Bon Voyage Reaction
Leonard gets an opportunity to work on a Stephen Hawking project but is apprehensive because it will keep him away from Penny for three months. Penny gets some advice from Bernadette, since she was in a similar position while Wolowitz was in space, and she ultimately decides that she can handle it. Penny drops Leonard off at the airport, then goes to see Koothrappali, who just learned that Lucy broke up with him because she felt too uncomfortable. As Penny and Koothrappali talk, they get into some emotional issues and both wind up crying. Penny eventually realizes that Koothrappali has had nothing to drink, indicating that he has finally overcome his fear of talking to women.

descriptions from: CBS
image from: tvdb

waterlilybarb

Episode 1: The Hofstader Insufficiency
Leonard is away on the research vessel in the North Sea, and Penny and Sheldon are missing him. Sheldon doesn’t really come out and say it – but he clearly is clinging to Penny for comfort. In the meantime Koothrapoli is now able to talk to women without booze, but he remains heartbroken over Lucy. He runs into Ms. Davis at a University event, and they learn that they are both heartbroken, as her husband just left her. Bernadette and Amy are at a conference out of town together, and they decide to visit the hotel bar, where some guys try to buy them drinks. Later, they chat about the type of guys they like – and they end up weirdly describing Sheldon and Howard – but Amy describes Howard as her type, and Bernadette describes Sheldon.

Episode 2: The Deception Verification
Leonard surprises Penny by coming back from his research expedition early, but he wants to keep it secret from everyone else to spend some alone time with her. Sheldon figures out that Leonard came back without telling him, however, and gets very upset. Meanwhile, Howard has been acting snippy and sensitive lately, and Bernadette eventually figures out that it's due to the estrogen cream he's been rubbing on his mother.

Episode 3: The Scavenger Vortex
The gang decides to plan an epic scavenger hunt in the vein of the old college scavenger hunts at Princeton and M.I.T. Koothrappali acts as the game master and plans the event, while the rest of the group pairs off into teams: Amy with Wolowitz, Leonard with Bernadette, and Penny with Sheldon. As they go through the various challenges, Wolowitz and Amy bond over their mutual love of Neil Diamond, Penny and Sheldon work surprisingly well as a team, and Bernadette reveals her insanely competitive nature.

Episode 4: The Raiders Minimization
Sheldon is crushed when Amy manages to point out a major plot hole in Raiders Of The Lost Ark, one of his favorite films, so he tries to get back at her by ruining one of her favorite childhood shows. Meanwhile, Leonard takes advantage of Penny's sympathy for his mommy issues in order to get her to do the things he wants to do, and Koothrappali and Stuart decide to try out online dating.

Episode 5: The Workplace Proximity
When Amy is asked to work on an experiment at Caltech, she asks Sheldon if he has a problem if they work in proximity to each other. He tells her he does not take issue with it, but after he speaks to the guys about it, they convince him that working near her will be a recipe for trouble. Sheldon interrupts girls’ night at Penny’s to tell Amy that he has reconsidered and does not want her to accept the job, but Amy tells him it is too late to renege. After Amy shows up at Caltech, Sheldon realizes that he has overreacted and tries to make conversation with her colleagues, only to inadvertently embarrass her with his inappropriate comments. Working in proximity to each other thus becomes a problem for Amy rather than Sheldon. He ends up apologizing to Amy with a heartfelt speech about the difficulty of being in a relationship with someone who has trouble with everyday social situations. When she assures him that he isn’t a weirdo, Sheldon explains that he was referring to her as the socially awkward one in the relationship. Meanwhile, Bernadette is annoyed at Howard for warning Sheldon about the woes of working with a significant other and makes him stay at Koothrappali’s place. Howard and Koothrappali have fun living together like an old married couple. Bernadette and Amy both complain to Penny about their relationship problems and Penny assures them that she will have Leonard set the guys straight. Instead of working through their issues, the guys use lasers to shoot balloons out of the air.

Episode 6: The Romance Resonance
Wolowitz recruits the gang to help him perform a special song he wrote, called, "If I Didn't Have You (Bernadette's Song)," to commemorate the anniversary of his first date with Bernadette. His announcement is so romantic it prompts Leonard to mention to Penny that she doesn’t really do romantic stuff for him (which is different from sex stuff). She’s disappointed with herself when she’s unable to come up with any romantic ideas and apologizes to him by showing him her mementoes of all the romantic things he’s done for her. Leonard finds it very romantic that she’s kept all those things. Later, Wolowitz’s plan goes awry when Bernadette ends up being put in quarantine for the night, but he ends up serenading her in quarantine anyway. Meanwhile, Sheldon discovers a way to synthesize a new element, which is a tremendous scientific accomplishment. Sheldon is thrilled but when he and Amy are in the process of cataloguing all the implements he used to make his discovery to send to the Smithsonian, he realizes he miscalculated in his work and stumbled upon the discovery by accident. Sheldon feels like a total fraud because even though he got the right result, he didn’t get there the right way, and he eschews all of the positive praise that comes his way for the discovery.

Episode 7: The Proton Displacement
Sheldon gets offended when Arthur Jefferies (Professor Proton) asks Leonard to read his latest scientific paper. After being repeatedly hounded by Sheldon, Arthur finally relents and asks Sheldon to read the paper, only to learn that Sheldon hacked into Leonard's email and read it already. Meanwhile, Koothrappali joins Penny, Amy, and Bernadette for a girls night where they make homemade jewelry. He gets upset when Wolowitz comes and steals his thunder by teaching the girls how to use his engineering tools to make even fancier pieces of jewelry.

Episode 8: The Itchy Brain Stimulation
Sheldon discovers a DVD that Leonard was supposed to return to the video store seven years ago. Leonard tries to talk Sheldon down and tells him to not freak out, but Sheldon explains when things like this happen it’s like an itch in his brain he can’t scratch. As penance, Leonard agrees to wear an itchy sweater until he rectifies the situation, thinking it's an easy fix and he can prove Sheldon wrong. Unfortunately, the video store has long since closed and the owner has passed away, and the itching gets unbearable for Leonard. Sheldon finally confesses to Leonard that when he learned the DVD hadn’t been returned, he paid for it and waited for the day that he could use it as a "teaching moment” for Leonard. Meanwhile, Penny sees Lucy at the Cheesecake Factory and mentions to her that Raj was really upset when Lucy broke up with him. Raj gets angry with Penny for making him look bad, but when Lucy emails him and asks him out for coffee, he quickly changes his tune. Lucy tells him that she is seeing someone else now, so Penny offers to set him up with one of her work friends, but that date goes terribly.

Episode 9: The Thanksgiving Decoupling
Wolowitz invites the gang over to his mother's house for Thanksgiving because his father-in-law, Mr. Rostenkowski, is coming and he's looking for a buffer. Sheldon resists because he likes routine of Leonard cooking a bad turkey every year, but he eventually relents and ends up bonding with Mr. Rostenkowski over beers and a football game. Meanwhile, Leonard and Penny get into an argument after she shares a story about a Thanksgiving she spent in Las Vegas with her old boyfriend Zack, whom she accidentally married there without realizing it. Chaos ensues when Zack arrives at the dinner to sign annulment papers, and Mrs. Wolowitz is too sick to cook.

Episode 10: The Discovery Dissipation
Sheldon goes on Ira Flatow's 'Science Friday' show on NPR to talk about his accidental discovery of a new element, but continues to convey his bad attitude for the undue recognition he's received. To help, Amy decides to bring in Wil Wheaton to talk to Sheldon about coping with notoriety. Wil tells Sheldon how difficult his life was because of all the negative feedback and backlash he got for being on Star Trek and how he got past it. Leonard also tries to help Sheldon by proving that his theory was wrong, which results in Sheldon getting upset with him and longing for the spotlight again. Meanwhile, Koothrapalli stays with Bernadette and Wolowitz, but he ends up getting kicked out because he's the perfect houseguest and makes both Wolowitz and Bernadette feel inadequate about their contribution to the household.

Episode 11: The Cooper Extraction
Sheldon has to go back to Texas when he learns that his sister is going into labor, leaving the rest of the gang to prepare for Christmas without him. As they gather to begin decorating the apartment tree, they begin to wonder what their lives would have been like if none of them had ever met Sheldon, imagining various scenarios from that alternate reality. Wolowitz postulates that he'd still be living with his mother, though he'd have killed her long ago, ala Psycho. Bernadette argues that she probably never would have married Wolowitz, given that he and Koothrappali can act like a gay couple from time to time. Amy states that Penny wouldn't have been able to resist Sheldon's raw sexuality and would've tried to sleep with him long ago. Throughout the various fantasy sequences, Sheldon calls them via Facetime to complain about the messy, disgusting delivery process, but Amy convinces him to stay the course and be there for his sister. The gang then comments on how much of a positive impact Amy has had on Sheldon, and Leonard proves it to her by showing her that Sheldon made a picture of her his desktop screensaver.

Episode 12: The Hesitation Ramification
Penny gets excited when she learns that she’s been cast in an upcoming episode of NCIS and plans a big viewing part for the gang to watch her episode. However, when the episode airs, she learns that her scene was cut and gets very depressed. Leonard tries to cheer her up, but she counters that she’s been trying to work as an actress for ten years and has nothing to show for it. When Leonard reminds her that she has him and their relationship, she proposes to him on the spot, acknowledging that he’s the one good thing in her life she doesn’t want to lose. Leonard knows the proposal is coming out of desperation and hesitates to say yes, so Penny rescinds her offer and leaves things very cold between them. Meanwhile, Koothrappali and Stuart try to strike up conversations with strangers at the local mall, and Sheldon endeavors to become a comedic genius by studying all forms of comedy for a few days.

Episode 13: The Occupation Recalibration
Leonard is relieved to learn that Penny doesn’t want to break up with him after he rejected her marriage proposal, but is surprised to hear that she quit her job at the Cheesecake Factory to pursue acting full time. She gets upset with him when he seems less than enthused about the idea, but receives unlikely support from Sheldon, who spends the day with her after being forced to use his vacation days by the university. Sheldon believes that the only way to truly succeed at something is to devote one hundred percent of one’s efforts toward a goal, and Penny desperately needed to hear that. Meanwhile, Wolowitz and Koothrappali try to help Amy fend off the romantic advances of her awkward coworker, and Stuart accompanies Bernadette to a rival comic shop to find a replacement comic book for Wolowitz after she accidentally destroyed his copy.

Episode 14: The Convention Conundrum
When the guys are unable to get tickets to this year's Comic-Con, Leonard, Wolowitz, and Koothrappali decide to buy scalped tickets from a stranger, but they worry about getting caught with fake tickets and arrested. Sheldon refuses to buy scalped tickets and instead opts to start his own convention, leading him to search for a suitable star to appear on one of the panel discussions. After a lot of rejections, Sheldon tracks down James Earl Jones at his favorite sushi restaurant in LA and miraculously winds up bonding with the iconic actor. The two share a night full of adventures and James invites Sheldon and the guys to attend Comic-Con as his personal guests. Meanwhile, the ladies try to have fun like mature adults by going to a new tea place at a popular local hotel, but they all wind up feeling that growing up is overrated.

Episode 15: The Locomotive Manipulation
Amy convinces Sheldon to take a romantic trip to Napa for Valentine’s Day aboard a classic train, and Wolowitz and Bernadette go with them. It seems like a perfect plan until Sheldon meets another passenger on the train, Eric, who is an equally passionate train enthusiast, and focuses most of his attention there. Amy confronts him about ruining their romantic night, and Sheldon launches into a tirade about romantic gestures. Sheldon kisses Amy out of spite, but in the kiss, we see him soften and enjoy it. Meanwhile, Leonard and Penny are home alone for Valentine’s Day, so they volunteer to watch Cinnamon for Koothrappali, who has booked some alone time up at the big telescope. Cinnamon manages to eat a box of chocolates while Leonard and Penny aren’t looking and they have to take her to the vet. Koothrappali rushes back to be with Cinnamon and winds up finding a little romantic connection with the vet, Yvette.

Episode 16: The Table Polarization
Leonard decides to get a dining table for the apartment, but Sheldon doesn't like the notion of this big change and resists at every turn. Through some clever manipulation, Penny and Amy convince their boyfriends to come to an agreement and they keep the table -- though the gang still decides to eat around the couch and on the floor anyway. Wolowitz is asked to go back to the space station sometime in the near future and he leaps at the opportunity. Bernadette and Koothrappali try to gently remind him that he was an absolute mess up there and it terrified him, but Wolowitz won't hear it. They are forced to stage an intervention, bringing in Bernadette's father and Mike Massimino via Skype later to tell Wolowitz that he has the wrong stuff. Wolowitz eventually comes around, but now he has to figure out how to get out of the mission while saving face. Ultimately, he goes to a doctor and has his blood pressure taken while on the phone with his mother, and he's declared medically unfit to go back to space.

Episode 17: The Friendship Turbulence
Wolowitz attempts to mend his strained friendship with Sheldon by inviting him on a trip to Houston to see NASA. Sheldon gladly accepts and they try their best to avoid insulting or irritating one another, but they end up fighting while onboard the plane, only to be brought back together as the plane hits a very rough patch of turbulence. Meanwhile, Penny’s car breaks down and she fears she’ll have to go back to waitressing, so Leonard surprises her and buys her a used car so she can still go to auditions. Koothrappali also gets upset with Amy when she tries to help him woo a woman on an online dating site and she winds up having more in common with her than he does.

Episode 18: The Mommy Observation
Sheldon and Wolowitz are still in Houston and Sheldon decides to surprise his mother with a visit. When they get there, Sheldon looks in the window, sees his mother having sex, and leaves before she sees him. Wolowitz convinces Sheldon to go back and talk to his mother but Sheldon only ends up insulting her. Wolowitz then tells Sheldon how he faced a similar situation with his mother in the past, and that Sheldon shouldn’t stand in the way of his mother’s happiness. In the end, Sheldon goes to talk to his mother and ends up giving her a lecture about safe sex. Meanwhile, the group is back at the apartment eating Thai food when Stuart collapses and seems to die. It turns out to be the set up for another one of Koothrappali’s murder mystery games that everyone dislikes. Koothrappali has written down scenarios for where everyone is in 20 years and it turns out Penny and Leonard are living in different cities. This leads to a meaningful conversation about what their future holds.

Episode 19: The Indecision Amalgamation
While Raj is wracked with guilt when he tries to date two women at once, Penny wrestles with whether to take a role in a cheesy movie and Sheldon is torn trying to choose between two gaming systems.

Episode 20: The Relationship Diremption
Sheldon faces a personal crisis after deciding he’s wasting his time with string theory. Meanwhile, a double date between Raj, Emily and the Wolowitzes ends in embarrassment for Howard.

Episode 21: The Anything Can Happen Recurrence
When Sheldon tries to be spontaneous, it leads to unexpected friction between Penny, Amy and Bernadette. Meanwhile, Raj seeks Howard’s help in preparing for a date with Emily.

Episode 22: The Proton Transmogrification
Professor Proton helps Sheldon cope with grief, while Leonard turns a relationship milestone into a competition with Penny. Meanwhile, Amy and Bernadette make a "Star Wars Day” gift for the guys.

Episode 23: The Gorilla Dissolution
A bad day causes Penny to reevaluate her life choices – including Leonard. Meanwhile, Howard and Bernadette struggle to care for Mrs. Wolowitz, and Raj gets relationship advice from Sheldon.

Episode 24: “The Status Quo Combustion”
Sheldon is forced to confront an uncertain future and considers a major move. Meanwhile, Raj and Emily take it to the next level, and Mrs. Wolowitz’s injury is a major headache for Howard and Bernadette.

descriptions from: CBS
image from: tvdb

waterlilybarb

Episode 1: The Locomotion Interruption
Leonard and Amy take an unexpected road trip to Arizona to pick up Sheldon. Meanwhile, Penny interviews for a job at Bernadette’s company, and Howard is weirded out by Stuart’s relationship with Mrs. Wolowitz.

Episode 2: The Junior Professor Solution
When Sheldon is forced to teach a class, Howard surprises everyone by taking it. Meanwhile, the tension between Penny and Bernadette gives Amy a chance to play both sides.

Episode 3: The First Pitch Insufficiency
Wolowitz is nervous after NASA asks him to throw out the first pitch at a Los Angeles Angels game. Also, Leonard and Penny try to prove Sheldon wrong after he says that he and Amy are a "superior couple."

Episode 4: The Hook-Up Reverberation
Raj’s honesty about his past comes back to haunt him after his girlfriend, Emily, is cold to Penny. Also, the guys consider becoming part-owners in Stuart’s comic book store.

Episode 5: The Focus Attenuation
Amy and Bernadette accuse Penny of being a "buzzkill” after she gets an email from work during their Vegas weekend. Meanwhile, the guys try to invent something cool, but only come up with new ways to procrastinate.

Episode 6: The Expedition Approximation
Sheldon and Raj test whether they could survive a dark-matter research expedition in a salt mine by simulating the conditions in a steam tunnel. Meanwhile, Leonard and Penny seek advice from Wolowitz and Bernadette after they fight about money.

Episode 7: The Misinterpretation Agitation
The guys try to help Penny out of an awkward work dilemma. Meanwhile, Amy and Bernadette argue over whether or not female scientists should play up their sexuality.

Episode 8: The Prom Equivalency
When the gang recreates a high school prom on the roof the of the guys’ apartment building, Sheldon feels pressure to participate in all the typical romantic traditions.

Episode 9: The Septum Deviation
When Leonard gets minor surgery on his nose, Sheldon is the one in need of sympathy. Meanwhile, Raj’s parents’ impending divorce causes Howard and Bernadette to work on their own marriage.

Episode 10: The Champagne Reflection
Sheldon says a tearful goodbye to "Fun with Flags.” Also, Leonard, Howard and Raj look for something significant in a dead professor’s research, and Bernadette is shocked to learn her co-workers’ true feelings from Penny.

Episode 11: The Clean Room Infiltration
Leonard and Wolowitz nearly come to blows and turn to Raj for help in dealing with a work emergency. Meanwhile, Amy throws an authentic Victorian Christmas party, and Sheldon seeks revenge on her for making him celebrate the holidays.

Episode 12: The Space Probe Disintegration
Wolowitz tries to distract Raj, who is anxiously awaiting data from a space probe he helped launch. Meanwhile, Sheldon and Leonard go dress shopping with Penny and Amy.

Episode 13: The Anxiety Optimization
In the hopes of achieving a scientific breakthrough, Sheldon invites his friends to challenge him. Also, Wolowitz invents an embarrassing game about Raj.

Episode 14: The Troll Manifestation
After Leonard and Sheldon co-publish a physics paper, they must defend themselves against criticism from an online bully. Also, girls’ night finds Penny, Amy and Bernadette confronting embarrassing moments from their past.

Episode 15: The Comic Book Store Regeneration
Wolowitz receives some shocking news as everyone prepares for the reopening of Stuart’s comic book store. Penny teaches Sheldon how to "let it go,” but can’t follow her own advice after she learns something infuriating about Amy. Also, Leonard and Raj think they spot Nathan Fillion at a restaurant.

Episode 16: The Intimacy Acceleration
As a joke, Sheldon and Penny try an experiment designed to make participants fall in love. Also, Leonard, Amy, Raj and Emily spend the evening trying to escape a room with a "zombie.” And, after returning from Mrs. Wolowitz’ funeral, Bernadette and Howard run into trouble at the airport.

Episode 17: The Colonization Application
Trouble arises when Amy learns Sheldon has applied for a one-way mission to colonize Mars. Also, a trip to the pet store ends in a fight for Sheldon and Amy, Leonard surprises Penny with a very "adult” purchase, and, Raj is caught snooping in Emily’s apartment.

Episode 18: The Leftover Thermalization
Friction ensues when a magazine fails to mention Leonard in an article about the paper he co-wrote with Sheldon. Also, a blackout at Mrs. Wolowitz’s home leads to a final family dinner in her honor.

Episode 19: The Skywalker Incursion
When Leonard and Sheldon are invited to speak at UC Berkeley, they take a detour to try to meet an idol. Also, when Bernadette and Howard battle over the fate of his Dr. Who TARDIS, Raj and Amy offer to settle the dispute with a game of ping pong.

Episode 20: The Fortification Implementation
When Sheldon and Amy build a blanket fort, they come to major crossroads in their relationship. Also, Wolowitz meets the half-brother he never knew he had, and when Penny is invited to appear on Wil Wheaton’s podcast, she and Leonard have a huge, on-air argument.

Episode 21: The Communication Deterioration
When Raj is asked to create a message in case a NASA mission discovers alien life, the guys fight over what he should do. Also, Penny is torn between auditioning for a movie or keeping her successful pharmaceutical sales job.

Episode 22: The Graduation Transmission
Wolowitz questions his engineering abilities when he and Sheldon can’t get a toy drone to fly. Meanwhile, a cancelled flight nearly prevents Leonard from giving the commencement address at his former high school, and Raj pits his parents against each other when his father cuts him off financially.

Episode 23: The Maternal Combustion
Personalities collide when Sheldon and Leonard’s mothers finally meet. Meanwhile, Howard finally decides to "man up” and do his fair share of the housework – but not without a little help from his friends.

Episode 24: The Commitment Determination
Sheldon pushes Leonard and Penny to choose a date for their wedding and deals with dramatic changes in his own relationship with Amy.

descriptions from: CBS
image from: tvdb

waterlilybarb

Episode 1: The Matrimonial Momentum
After driving to Vegas to get married, Penny struggles with Leonard’s confession that he kissed another girl. Also, Sheldon doesn’t know how to act after Amy pushes pause on their relationship.

Episode 2: The Separation Oscillation
Leonard confronts the woman he kissed on the North Sea in an attempt to set Penny’s mind at ease. Also, Sheldon films a special episode of "Fun with Flags” after his breakup with Amy, and Bernadette feels guilty about withholding a secret from Penny.

Episode 3: The Bachelor Party Corrosion
The guys’ science skills are put to the test when they get a flat tire during Leonard’s bachelor party weekend in Mexico. Also, the girls force Penny to finally tell her family that she eloped with Leonard.

Episode 4: The 2003 Approximation
Sheldon learns of an impending change in his living arrangements and decides to revert back to 2003, a simpler time before he met Leonard and Penny. Also, Howard and Raj form a band to play at the Comic Book Store.

Episode 5: The Perspiration Implementation
The guys take a fencing lesson from Barry Kripke and Sheldon finds himself in an awkward position when Kripke expresses interest in Amy.

Episode 6: The Helium Insufficiency
In the midst of a nation-wide helium shortage, Sheldon and Leonard take desperate measures to get the supplies they need. Also, Penny and Bernadette download a dating app on Amy's phone to try and find her a new man.

Episode 7: The Spock Resonance
Sheldon's interview for a "Star Trek" documentary focusing on Spock turns up a shocking revelation about his breakup with Amy. Meanwhile, the Wolowitzes haggle over the remodeling of his family home.

Episode 8: The Mystery Date Observation
When Leonard, Penny and Bernadette learn that Amy is going out on a dinner date, the trio set out to spy on her and the guy. Meanwhile, Sheldon recruits Raj and Howard to find a woman for him.

Episode 9: The Platonic Permutation
Sheldon and Amy try hanging out as friends when they spend Thanksgiving together at the aquarium. Also, Wolowitz reluctantly agrees to volunteer at the soup kitchen with Bernadette, Raj and Emily, and Penny discovers that Leonard knows more about her than she thought.

Episode 10: The Earworm Reverberation
Sheldon has a revelation when he realizes why a song was stuck in his head. Also, Amy invites Dave over for dinner despite their previously awkward date, and Wolowitz and Koothrappali become obsessed with a fan of their band, "Footprints on the Moon".

Episode 11: The Opening Night Excitation
As the guys prepare to go to the premiere of the new Star Wars movie, Sheldon plans a special event for Amy's birthday.

Episode 12: The Sales Call Sublimation
Penny gets more than she bargained for when Leonard agrees to meet with a psychiatrist on her behalf. Also, Sheldon and Koothrappali collaborate on an astronomical discovery, and Wolowitz and Bernadette can’t believe what they are feeling after Stuart moves out.

Episode 13: The Empathy Optimization
After having to deal with a sick Sheldon, Leonard, Penny and the gang try to treat themselves to a Sheldon-free weekend.

Episode 14: The Meemaw Materialization
Sheldon’s thrilled when his Meemaw comes to visit, but his excitement quickly fades when she butts heads with Amy. Also, Raj meets a new girl at the comic book store who makes him question his relationship with Emily.

Episode 15: The Valentino Submergence
Sheldon and Amy host a live Valentine’s Day episode of Fun with Flags, Leonard and Penny grapple with getting older, Howard and Bernadette find a surprise in their hot tub and Raj is torn between Emily and the cute girl he met at the Comic Bookstore.

Episode 16: The Positive Negative Reaction
When the gang finds out about Bernadette’s pregnancy, they celebrate by singing karaoke. Also, Bernadette is concerned when Wolowitz freaks out over her pregnancy announcement, and Wolowitz is convinced he must make more money to provide for the baby.

Episode 17: The Celebration Experimentation
After more than nine years together, the gang finally celebrates Sheldon’s birthday, surprising him with a special guest.

Episode 18: The Application Deterioration
Leonard, Sheldon, and Wolowitz run into problems when they file for a patent for their infinite persistence gyroscope. Also, Penny, Amy and Bernadette give Koothrappali dating advice when Emily reaches out to him after their breakup.

Episode 19: The Solder Excursion Diversion
Amy is shocked at a revelation from Sheldon after she buys him a new laptop. Also, Koothrappali sells out Leonard and Wolowitz after they lie to their wives in order to attend an early screening of a movie.

Episode 20: The Big Bear Precipitation
Sheldon spills a secret of Leonard’s when the two take a weekend cabin trip with Penny and Amy. Also, when Koothrappali goes overboard with pregnancy gifts, Wolowitz and Bernadette must draw the line.

Episode 21: The Viewing Party Combustion
Everyone must choose sides when a small argument between Leonard and Sheldon erupts into a heated fight during a group get-together.

Episode 22: The Fermentation Bifurcation
The gang goes to a wine bar and runs into Penny’s old boyfriend, Zack (Brian Thomas Smith). Also, Bernadette gets stuck spending the evening with Sheldon when she can’t go wine tasting with the group, and things don’t go as planned when Koothrappali introduces his new girlfriend, Claire.

Episode 23: The Line Substitution Solution
Sheldon hires Stuart to spend the day with Amy when he’d rather go to a movie screening. Also, Leonard’s mother, Beverly, comes to town and Penny struggles to make a connection with her.

Episode 24: The Convergence Convergence
Leonard and Penny plan to get remarried in front of their friends (who show up), Leonard's parents, Beverly and Alfred and Sheldon's mother, Mary, who finds something in common with Alfred. Howard gets an unknown email from the Air Force about his invention.

descriptions from: CBS
image from: tvdb