Orphan Black Season 1 - Complete Season 1 and Episode Guide

Orphan Black Season 1 Episodes

Find out how to watch Season 1 of Orphan Black tonight at the American TV Listings Guide

Orphan Black TV Listings Guide Seasons & Episodes Cast

Season 1 Episode Guide

Episode 1 - Natural Selection

Sarah, a streetwise hustler on the run from a lifetime of bad decisions, witnesses the suicide of a stranger who looks just like her. Sarah assumes her identity, hoping that cleaning out the dead woman’s bank account will solve all of her problems. Instead, the street smart chameleon is thrust headlong into a kaleidoscopic mystery. After taking on the new identity, Sarah quickly finds herself caught in the middle of a deadly conspiracy and must race to find answers.

Episode 1 - Season 1, Episode 1, "Natural Selection"

Episode 2 - Instinct

With a body in her car and nowhere to turn, Sarah is forced to continue her con and earn "Beth" a second chance on the force. But with a killer on her tail, her only hope of finding answers lies with another apparent 'identical,' Alison.

Episode 2 - Season 1, Episode 2, "Instinct"

Episode 3 - Season 1, Episode 3, "Variation Under Nature"

Rocked by the revelation that she and her fellow "Orphans" are clones, Sarah just wants to get her hands on the money and skip town. But Sarah's fake detective ruse stretches thin when the cops find the body she buried and assign "Beth" to the case. As Sarah closes in on the killer, the hunter becomes the hunted.

Episode 3 - Variation Under Nature

Episode 4 - Effects of External Conditions

Sarah realizes that the Orphans' survival is going to take more than police work. But tracking the killer threatens Sarah's long awaited reunion with her daughter, Kira. As Sarah gets closer to the killer, the killer gets closer to the truth - the ensuing showdown threatens to expose her ruse as a cop.

Episode 4 - Season 1, Episode 4, "Effects of External Conditions"

Episode 5 - Conditions of Existence

When terrifying evidence suggests the Orphans are part of a sinister ongoing experiment, Sarah's suspicions turn to Paul, Beth's boyfriend. But her probing inadvertently triggers Paul’s own investigation, bringing him dangerously close to the truth. Meanwhile, paranoid Alison piles on a whole new level of complication.

Episode 5 - Season 1, Episode 5, "Conditions of Existence"

Episode 6 - Variations Under Domestication

Sarah's hunt for answers is interrupted by a trip to the suburbs. Alison's paranoia has boiled over, putting all the Orphans at risk. But when Sarah, Alison and Beth's worlds dangerously collide, Sarah must decide who to trust with her secret.

Episode 6 - Season 1, Episode 6, "Variations Under Domestication"

Sarah’s hunt for answers is interrupted by a trip to the suburbs. Alison’s paranoia has boiled over, putting all the Orphans at risk. But when Sarah, Alison and Beth’s worlds dangerously collide, Sarah must decide who to trust with her secret.

Episode 7 - Season 1, Episode 7, "Parts Developed in an Unusual Manner"

With Paul missing, Sarah is forced to confront the conspiracy head on. But when Paul learns Sarah has kept essential information from him, the fragile trust between them threatens to shatter. Meanwhile, Cosima grows closer to Delphine and the dangerously fascinating Dr. Leekie.

Episode 7 - Parts Developed in an Unusual Manner

Episode 8 - Season 1, Episode 8, "Entangled Bank"

Sarah’s actions pit the Orphans against each other as she tries to plan her next move. As Paul tries desperately to cover up Sarah’s existence, Alison takes vengeance on her suspected monitor, which could cost her everything she holds dear.

Episode 8 - Entangled Bank

Episode 9 - Unconscious Selection

After Kira's life is threatened, Sarah is on the warpath, but Dr. Leekie makes her think twice about her plans for revenge. Meanwhile, Cosima faces the truth about Delphine, forcing her to choose sides. Now, it's up to Sarah to decide the killer's fate, but the truth about where Sarah came from changes everything.

Episode 9 - Season 1, Episode 9, "Unconscious Selection"

Episode 10 - Endless Forms Most Beautiful

Sarah's last chance to bring her nemesis back to sanity slips away as Art intervenes to get answers of his own. Meanwhile, the Orphans must decide whether to make peace with their creators, as Sarah is forced into a deadly confrontation with their enemy.

Episode 10 - Season 1, Episode 10, "Endless Forms Most Beautiful"

Episode 11 - Season 2, Episode 1, "Nature Under Constraint and Vexed"

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. Alison and Donnie attend the funeral of her fallen friend, Aynsley, causing Alison to sink into guilt and despair. Cosima is faced with a perplexing decision that may have dire consequences.

Episode 12 - Season 2, Episode 2, "Governed by Sound Reason and True Religion"

While Alison struggles with Aynsley's death and Cosima grapples with the worsening symptoms of her mysterious sickness, Sarah enlists Art's help to find Kira and is shocked when she learns where the trail leads.

Episode 13 - Season 2, Episode 3, "Mingling Its Own Nature With It"

After hitting the road with Felix, Sarah 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 14 - Season 2, Episode 4, "Governed As It Were By Chance"

Sarah comes home to look for answers. With Cosima’s help, she digs into the origins of the clone experiment. The hunt takes her right into the belly of the beast, but getting out again could cost her more than she knows.

Episode 15 - Season 2, Episode 5, "Ipsa Scientia Potestas Est"

Rachel goes on the 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 16 - Season 2, Episode 6, "To Hound Nature in Her Wanderings"

Sarah joins forces with an unlikely and untrustworthy ally, following a trail of clues that she hopes will lead her to the origins of the clone experiment. Cosima and Delphine make a discovery that could prove to be the key to treating her illness. Alison finds herself in unsavory company at rehab.

Episode 17 - Season 2, Episode 7, "Knowledge of Causes and Secret Motion of Things"

When a rehab confidante betrays Alison and threatens to expose the truth about Aynsley's death, she goes into free fall on the eve of Family Day. With Donnie and the kids set to visit, it's all clones on deck to contain the fallout.

Episode 18 - Season 2, Episode 8, "Variable and Full of Perturbation"

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 struggles with the decision to surrender a crucial piece of leverage and make a deal with Dyad.

Episode 19 - Season 2, Episode 9, "Things Which Have Never Yet Been Done"

Cosima takes a turn for the worse, forcing Sarah to take desperate action – with tragic consequences for those she loves. The Proletheans set their ultimate plan in motion. Alison and Donnie tangle with the law.

Episode 20 - Season 2, Episode 10, "By Means Which Have Never Yet Been Tried"

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.

Episode 21 - Season 3, Episode 1, "The Weight of This Combination"

Sarah pursues the missing Helena who is held in a faraway compound. 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 22 - Season 3, Episode 2, "Transitory Sacrifices of Crisis"

Castor pursues the Leda clones for original tissue samples and Helena is examined by a mysterious new villain. The Castor boys are also out to play, toying with a frightened young woman, which ultimately sets Sarah – and Art – hot on the Castor trail.

Episode 23 - Season 3, Episode 3, "Formalized Complex and Costly"

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.

Episode 24 - Season 3, Episode 4, "Newer Elements of Our Defense"

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 25 - Season 3, Episode 5, "Scarred By Many Past Frustrations"

Helena and her sestra are reunited at the Castor camp when Sarah is captured. 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 Amish’ under the care of Mrs. S and an unwilling Felix. Cosima falls hard for an internet date, Shay.

Episode 26 - Season 3, Episode 6, "Certain Agony of the Battlefield"

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 27 - Season 3, Episode 7, "Community of Dreadful Fear and Hate"

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 Alison for a favor. An unassuming Scott gets closer to the greatest discovery of all, when he sits down with beleaguered clone Rachel.

Episode 28 - Season 3, Episode 8, "Ruthless in Purpose and Insidious in Method"

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 29 - Season 3, Episode 9, "Insolvent Phantom of Tomorrow"

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.

Episode 30 - Season 3, Episode 10, "History Yet to Be Written"

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.

Episode 31 - Season 4, Episode 1, "The Collapse of Nature"

After two months of respite, Sarah’s hard-won refuge in Iceland is shattered by a Neolution attack. Once again forced to flee, she realizes no matter how far her family runs it will never be far enough.

Episode 32 - Season 4, Episode 2, "Transgressive Border Crossing"

After evading a Neolution attack in Iceland, Sarah returns home to track down an elusive new ally. As Cosima struggles with Delphine’s disappearance, Alison and Donnie host a pregnant and ever-hungry Helena. Meanwhile Felix, feeling like an outsider, embarks on his own journey of self-discovery.

Episode 33 - Season 4, Episode 3, "The Stigmata of Progress"

As Sarah reels from the shocking discovery of Neolution’s biotech, she’s desperate to find answers. Eager to assist, Mrs. S strikes an alliance with an old nemesis. Rachel receives a visit from her keeper and takes a fraught step forward towards recovery. Meanwhile, Helena is mistaken for “Mrs. Hendrix” when she answers a visit from suspicious visitors.

Episode 34 - Season 4, Episode 4, "From Instinct to Rational Control"

Sarah realizes her goals have aligned with her once enemy and forms a precarious alliance in hopes of getting to the head of Neolution. Meanwhile, on her end, Alison dispatches Felix and Donnie to infiltrate a Neolution fertility clinic that Beth investigated. Back at the lab, Cosima and Scott receive a revolting delivery from Alison. As Rachel grows closer to Charlotte, Susan Duncan leaves a devastating decision in her hands.

Episode 35 - Season 4, Episode 5, "Human Raw Material"

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 36 - Season 4, Episode 6, "The Scandal of Altruism"

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 37 - Season 4, Episode 7, "The Antisocialism of Sex"

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 Hendrixes, 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 38 - Season 4, Episode 8, "The Redesign of Natural Objects"

As Alison is terrified by Neolution threats made against Donnie, Sarah and Mrs. S question her loyalty to her sestras. 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 39 - Season 4, Episode 9, "The Mitigation of Competition"

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 Hendrixes 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 40 - Season 4, Episode 10, "From Dancing Mice to Psychopaths"

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.

Episode 41 - Season 5, Episode 1, "The Few Who Dare"

Desperate to get off the island and reunite with her family, a wounded Sarah journeys into the island's interior, only to discover a mysterious village - the beating heart of the Neolution agenda.

Episode 42 - Season 5, Episode 2, "Clutch of Greed"

Dragged home from the Island by Neolution, Sarah refuses to follow Rachel's new regime. Sarah sets a plan in motion to get her and her daughter out of Neolution's reach for good.

Episode 43 - Season 5, Episode 3, "Beneath Her Heart"

As Clone Club reels from the loss of one of their own, Sarah gnaws at the shackles Rachel has firmly placed around her family. Alison struggles to find her place in the sisterhood.

Episode 44 - Season 5, Episode 4, "Let the Children & the Childbearers Toil"

Sarah and Siobhan follow a lead on a Neolution defector, hoping for enough leverage to free Kira from Dyad's clutches. Also, Cosima investigates rumors about a creature in the woods.

Episode 45 - Season 5, Episode 5, "Ease for Idle Millionaires"

While Sarah and Kira spend time at home bonding, Cosima unlocks the island's biggest secret, discovering a link between the village's so-called creature and the science around Kira.

Episode 46 - Season 5, Episode 6, "Manacled Slim Wrists"

Cosima is forced into an alliance with Susan Duncan when an old enemy returns to the Island. Meanwhile, on the mainland, Krystal stumbles onto a vital clue to the Neolution endgame.

Episode 47 - Season 5, Episode 7, "Gag or Throttle"

As Westmoreland demands a more aggressive approach with Kira, and Sarah fights to save her daughter, Rachel discovers a dark secret that makes her question her place within Neolution.

Episode 48 - Season 5, Episode 8, "Guillotines Decide"

With Kira safely out of Dyad, Mrs. S orders the sisters to take a night off from their sleuthing to celebrate Felix's art opening. A desperate Rachel reunites with an old ally.

Episode 49 - Season 5, Episode 9, "One Fettered Slave"

Sarah is still reeling from the loss of Mrs. S when another blow lands - Helena has been kidnapped! Clone Club bands together in a race against time, determined to find Helena before an unmasked, and unhinged John Mathieson lays hands on her babies.

Episode 50 - Season 5, Episode 10, "To Right the Wrongs of Many"

Now in labor, Helena is forced to hunker down in the basement of Old Dyad for the delivery. It's a cage match for survival as Sarah and Art struggle to protect her in a desperate last stand against Neolution.

Seasons

Season 1 , Season 2 , Season 3 , Season 4 , Season 5

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