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Episode 2x01: Nature Under Constraint and Vexed (Apr/19/2014)
Sarah is out of options, on the run, and pursued by deadly adversaries. Desperate to find her daughter Kira, Sarah suspects ruthless pro-clone Rachel is behind her daughter’s disappearance and sparks an all out war against her. Cosima is faced with a perplexing decision that may have dire consequences.

Episode 2x02: Governed by Sound Reason and True Religion (Apr/26/2014)
While Alison deals with Aynsley’s death and Cosima grapples with her worsening symptoms, Sarah enlists Art’s help to find Kira, but is shocked to where the trail leads.

Episode 2x03: Mingling Its Own Nature With It (May/03/2014)
As Sarah hits the road with Felix and Kira, she is forced to turn to a ghost from her past -- an old flame named Cal Morison. When their brief respite is brutally shattered, Sarah realizes that no matter how far she runs, it will never be far enough.

Episode 2x04: Governed As It Were By Chance (May/10/2014)
Sarah comes home looking for answers, and with the help of Cosima, they begin digging into the origins of the clone experiment. The hunt for answers takes her right into the belly of the beast, but getting out could cost her more than she knows.

Episode 2x05: Ipsa Scientia Potestas Est. (May/17/2014)
Rachel goes on a warpath, lashing out at Sarah’s nearest and dearest. While she tries to keep her loved ones safe, an unexpected visitor threatens to derail Sarah's plans.

Episode 2x06: To Hound Nature in Her Wandering (May/24/2014)
Sarah joins forces with an unlikely and untrustworthy ally, to follow a trail of clues that she hopes will lead her to the origins of the clone experiment. Meanwhile, Cosima and Delphine make a discovery that could prove to be the key to treating her illness. Alison finds herself amongst unpleasant company, during her stay at rehab.

Episode 2x07: Knowledge of Causes, and Secret Motion of Things (May/31/2014)
On the eve of Family Day, Alison goes into free fall when a rehab confidante betrays her threatening to expose the truth about Aynsley’s death. It’s all clones on deck to contain the fallout, for Donnie and the kids visit.

Episode 2x08: Variable and Full of Perturbation (June/07/2014)
A new player in the clone conspiracy turns up at Felix’s door, sending him into crisis mode. With Cosima running out of options, Sarah weighs her options to decide whether or not to she should surrender a crucial piece of leverage and make a deal with Dyad.

Episode 2x09: Things Which Have Never Yet Been Done (June/14/2014)
Cosima takes a turn for the worse, forcing Sarah to take desperate action which results in tragic consequences for those she loves. The Proletheans set their ultimate plan in motion, while Alison and Donnie tangle with the law.

Episode 2x10: By Means Which Have Never Yet Been Tried (June/21/2014)
The war with Dyad is all but lost when Rachel’s latest ploy forces a broken Sarah to concede. The Clone Club springs into action, uniting in a reckless gambit to save Sarah. As they fight to gain their freedom, Sarah encounters a new ally and uncovers a terrifying new dimension to the conspiracy.

Information sources: SPACE & TVrage
Image Source: tvdb

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Episode 3x01: The Weight of This Combination (Apr/18/2015)
Sarah pursues the missing Helena who is held in a faraway compound. Sarah must use her wiles – and acting chops – to deter a Topside investigator who threatens the Leda sisters’ lives. Meanwhile, Cosima appears to be rebounding from her illness, while Alison and Donnie face newfound financial woes. But when the menace of Castor rears its head once more, Sarah and her entire family must come together to survive.

Episode 3x02: Transitory Sacrifices of Crisis (Apr/25/2015)
Castor pursues the Leda clones for original tissue samples. Helena, who is pregnant and imprisoned, is examined by a mysterious new villain. The Castor boys are also out to play, toying with a frightened young woman, Patty, in a sexy switcheroo that ultimately sets Sarah – and Art – hot on the Castor trail. But it’s not all fun and games for the Castor boys, as Sarah gleans they may have a mysterious defect that puts their lives in peril.

Episode 3x03: Formalized, Complex, and Costly (May/2/2015)
Leda and Castor are both on the hunt for original clone DNA. On-the-lam, Mark and Gracie pursue new leads to find the samples that might set them free, while Art and Sarah reunite to track them down. Meanwhile, Cosima and Scott try to learn more about Castor’s biology and Alison’s new money-making venture is going gangbusters. A shocking revelation about the Castor-Leda connection leaves the sisters reeling, just before Sarah witnesses a deadly Prolethean-Castor face-off.

Episode 3x04: Newer Elements of Our Defence (May/9/2015)
Mark is taken down in a Prolethean shoot-out and Sarah must step in to help. But as Sarah gathers intel that puts her on the trail of the original Castor DNA, a familiar foe is not far behind. While Helena continues to toil in a faraway military compound, it is ultimately Sarah’s fate that will hang in the balance as she tries to save her sister. Meanwhile, Gracie is cast out from the Prolethean fold, and Alison and Donnie come face-to-face with unhappy drug lord, Jason Kellerman.

Episode 3x05: Scarred by Many Past Frustrations (May/16/2015)
Helena and Sarah are reunited at the Castor camp. As Sarah suffers testing, Paul appears to chide her; but his allegiances are beginning to strain. While the Leda family worries about Sarah’s absence, Gracie ‘breaks loose’ under the care of Mrs. S and an unwilling Felix. Cosima falls hard for an internet date, Shay.

Episode 3x06: Certain Agony of the Battlefield (May/23/2015)
Paul digs and finds the ugly truth behind the Castor Boys’ logbooks of names, pushing him into action. Meanwhile, Felix is desperate for info on Sarah’s whereabouts, and presses the still-ailing Rachel for any shred of a lead. In order for Donnie and Alison to take their money-making endeavor to the “next level” she must introduce Jason Kellerman to her unique business plan.

Episode 3x07: Community of Dreadful Fear and Hate (May/30/2015)
Alison must secure a store front in order to take her and Donnie’s business to the “next level”. But things don’t go according to plan when her mother, Connie, proves to be a major hindrance. Cosima is facing familiar health issues and calls upon beleaguered Alison for a favor. But with Alison working to save an imperiled Donnie from the merciless hands of a drug lord, it’s Cosima who ends up doing a favor. An unassuming Scott gets closer to the greatest discovery of all, when he sits down with beleaguered clone Rachel.

Episode 3x08: Ruthless in Purpose, and Insidious in Method (Jun/6/2015)
When Rachel makes a promise to Sarah, it comes with a hefty price. Meanwhile, Helena and Gracie work with the Hendrixes, and Donnie takes Kellerman to task. Over at Castor, Coady and Benchman scheme to track down the Castor Original, and Rudy descends on DYAD for a much needed asset.

Episode 3x09: Insolvent Phantom of Tomorrow (Jun/13/2015)
Sarah, Felix and Mrs. S take a trip with the hopes of tracking down the Castor Original. But they are not alone. Back home, Donnie tries to save the family business when Pouchy defects, but it is Helena who manages to secure a “full refund.” Meanwhile, Cosima becomes suspicious of Shay, and Delphine takes the matter into her own hands. But nothing will ever be the same again when Leda finally finds what they’ve been looking for.

Episode 3x10: History Yet to Be Written (Jun/20/2015)
As Clone Club races towards the truth, Castor and Topside force Sarah to make uneasy alliances. But there is some rest for the wicked, when Donnie gives Helena an unexpected ‘gift’, and the results of Alison’s candidacy finally come in. Even as team Leda takes a moment to breathe, change is afoot and a life hangs in the balance.

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Episode 4x01: The Collapse of Nature (Apr/14/2016)
A flashback to Beth Childs' final investigation, days before her suicide.
After two months of respite, Sarah’s hard-won sanctuary in Iceland is shattered by a Neolution attack. Sarah, Mrs. S, Kendall, and Kira are forced back on the run, once again fleeing from a potent, faceless enemy with far-reaching and insidious power.

Episode 4x02: Transgressive Border Crossing (Apr/21/2016)
After evading a Neolution attack in Iceland, Sarah returns home to track down the elusive new ally that warned her to run. She follows in Beth’s footsteps to find MK and uncovers the next facet of Neolution’s agenda–implanting dangerous technological devices in humans.

Episode 4x03: The Stigmata of Progress (Apr/28/2016)
Desperate to remove the bot from her cheek, Sarah impulsively follows a lead into a harrowing encounter that requires the help of an uneasy ally.
  
Episode 4x04: From Instinct to Rational Control (May/5/2016)
Sarah forms an alliance with a former enemy in hopes of getting to the head of Neolution.  Elsewhere, Allison orders Felix and Donnie to invade a Neolution fertility clinic and a Susan Duncan leaves Rachel to make a devastating decision.
  
Episode 4x05: Human Raw Material (May/12/2016)
Sarah’s day off to reconnect with Kira quickly turns into a sleuthing mission aimed squarely at discrediting Felix’s new ties. Cosima steps up with Donnie to further investigate the Neolutionist fertility research center. While Donnie bumps into an all too familiar face, Cosima makes a shocking discovery that leads her into a dangerous encounter.
  
Episode 4x06: The Scandal of Altruism (May/19/2016)
When Cosima admits doubts about finding a cure in time to save her life, Sarah makes a lone decision that exposes Kendall to those she’s spent years hiding from. Meanwhile, Art and Felix team up to protect naïve clone, Krystal Godderitch, from herself.
  
Episode 4x07: The Antisocialism of Sex (May/26/2016)
Sarah regresses to old habits while struggling to cope with the consequences of her decisions —reconnecting with Beth on a dark night of the soul. Back at the lab, Cosima, haunted by vicious memories and news of Delphine, attempts a dangerous Hail Mary to find a cure. At the Hendrix's, Alison is more determined than ever to create normalcy for her kids. As she forges ahead with a birthday party, Donnie is caught in the Neolution crosshairs.
  
Episode 4x08: The Redesign of Natural Objects (June/2/2016)
As Alison is terrified by Neolution threats made against Donnie, Sarah and Mrs. S question her loyalty to her sisters. While Sarah is distracted, Siobhan sneaks out to seek vengeance. Meanwhile, Cosima and Susan Duncan work together in a final attempt to discover a cure.
  
Episode 4x09: The Mitigation of Competition (June/9/2016)
With Susan Duncan deposed, Sarah finds herself in the same position as Rachel — under the heel of a new HBIC — causing the archenemies to come together for the greater good. Cosima and Susan butt heads on the ethical implications of human experiments. Meanwhile, when the Hendrix's legal counsel, Adele, further investigates Donnie’s case, she begins to suspect Felix is keeping deep secrets. Helena’s arrival forces Felix to make a difficult decision.
  
Episode 4x10: From Dancing Mice to Psychopaths (June/16/2016)
In the season finale, when communication with Cosima is cut off and Neolution appears to be within striking distance, Sarah’s alliance with Rachel goes out the window. Sarah lures a high-level Neolutionist into a trap, and sets out to bring down Neolution once and for all.

Sources: tvdb & SPACE