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Episode 1: Wet Hot Demonic Summer
Twayne and Callie must infiltrate a secret Wizard compound where Leonard is training his apprentice. But their complicated strategy involves building a summer camp on a moment's notice, with Mark Lilly as their head counselor.  

Episode 2: Callie and Her Sister
After Callie repeatedly refuses to go through with her arranged marriage to Twayne, her parents temporarily get back together and have a second daughter to take her spot. After Mark and Callie move in together, they are forced to act as substitute parents for Callie's younger, hotter sister, who has evil plans regarding Mark

Episode 3: Ride Me to Hell
The end of his favorite TV series, "Dishonorable Discharge" sends Grimes off the deep end. Mark has to help him get to the bottom of his inexplicable attachment to the show, uncovering a deep seated memory along the way.

Episode 4: G. I. Twayne
Twayne is drafted into the Army of Satan. When Mark is forced to join him, he discovers a plan to end humanity. Special guest star: Rob Riggle as the drill sergeant.

Episode 5: The Ring of Powers
Mark accidentally puts on an engagement ring belonging to Leonard. Special guest star: Todd Barry as a dragon.

Episode 6: Attack of Mark's Clone
Callie creates clones of Mark to win a bowling tournament. But Mark's Clone finds a message in Callie's diary, and decides to get revenge by framing her for murder.

Episode 7: Wail Street
Randall puts Mark's soul up for sale, Grimes pursues his dream of creating a pop music act with a teen sensation.

Episode 8: Little Ship of Horrors
Twayne throws a company party aboard a cruise ship; Randall gets sick from dangerous pollen.

Episode 9: Lilly and the Beast
Callie reveals to Mark that she's been sleeping with other guys. A girlfriend from Marks past returns, with a dark secret.

Episode 10: Mummy Dearest
Randall feels neglected; Grimes mummy returns. Special guest star: Christine Baranski as Grimes' mummy.

Episode 11: Journey to the Center of Twayne
An ant-sized arsonist named Jerry flees Mark's custody, escaping up Twayne's nostril. A miniaturized Leonard, Grimes and Mark must track Jerry through Twayne's body to bring him to justice.

Episode 12: Any Given Workday
With the big company intramural football game around the corner, everyone starts getting nervous about the lineup -- Mark is a wonderful team player, but a terrible actual player. When Randall demonstrates the power of his recently replaced arm, he is given a job at the D.O.I. as the team's ringer.

Episode 13: The Roast of Twayne the Boneraper  
In honor of Twayne's 10-year anniversary of running the D.O.I., Callie and the crew throw him a Roast. But when Mark's attempt at edgy humor goes too far, Twayne quits, leaving Mark in charge. Before his first day as boss is up, Mark makes a management mistake so catastrophic that it almost destroys New York City.

Episode 14: Mark Loves Dick
Mark becomes conflicted about his relationship with Callie after she gets a promotion by turning herself into a man. He does his best to be understanding, but their love is soon put to the test when they are asked to embark on a dangerous mission to the fabled underwater city of Atlantis.

Episode 15: The Stalking Dead
When the country's biggest pop star (``Lady Hoo-Ha) turns into a zombie, millions of her devoted fans follow suit; Mark befriends one of the new zombies and Randall is forced to deal with his jealousy issues.

Episode 16 : The Dork Knight
After being bitten by a rabid Bat-Boy, Mark becomes a masked crimefighter; Mark wages war against New York's criminals and their catlike leader with the help of his loyal sidekick, Koala Man.

Episode 17: Fools for Love
Mark chooses April Fool's Day to ask Callie to take their relationship to the next level, but his romantic gesture is threatened when Callie's vengeful ex-boyfriend returns to win her back; Leonard tries to redeem a winning lottery ticket.

Source: Wikipedia
contributed by codebreaker