Sarah begins to question Alison's loyalty to her sestras, and Siobhan seeks vengeance.

The Redesign of Natural Objects

Drama

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.

Orphan Black

A stolen identity, a life full of secrets - stream the boxset now

A stolen identity, a life full of secrets - stream the boxset now. A woman plunges into terrifying world after stealing the identity of someone who looks just like her.

orphan-black

When Sarah witnesses the suicide of a stranger, it changes everything.

Natural Selection

After witnessing a woman's suicide Sarah assumes her identity, hoping that cleaning out the dead woman's bank account will solve her problems.

With a killer on her trail, Sarah tries to track down another identical.

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.

As Sarah closes in on the killer, the hunter becomes the hunted.

Variation Under Nature

After learning about her identity, Sarah's intention is to get the money and leave, but everything changes when the body is found.

Sarah realises that the Orphans' survival is going to take more than police work.

Effects of External Conditions

Sarah realises that the survival of the Orphans will take more than police work. Her reunion with Kira is in jeopardy.

New evidence suggests the Orphans are part of a sinister ongoing experiment.

Conditions of Existence

Sarah is suspicious of Paul when evidence suggests the Orphans are part of an ongoing experiment. Allison's paranoia becomes a problem.

Alison's paranoia has boiled over, putting all the Orphans at risk.

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.

With Paul missing, Sarah is forced to confront the conspiracy head on.

Parts Developed in an Unusual Manner

Paul goes missing, which compels Sarah to tackle the conspiracy herself. Cosima is drawn closer to Delphine and Dr Leekie.

Sarah's actions pit the Orphans against each other as she tries to plan her next move.

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.

Cosima faces the truth about Delphine, forcing her to choose sides.

Unconscious Selection

Dr Leekie gives Sarah pause for thought about seeking revenge, and Cosima must choose sides when she realises the truth about Delphine.

Sarah is forced into a deadly confrontation with the enemy.

Endless Forms Most Beautiful

Art's intervention ruins Sarah's chance to bring Helena back to sanity. The Orphans decide whether to form an alliance with the creators.

Sarah is on the run, pursued by deadly adversaries as she desperately searches for Kira.

Nature Under Constraint and Vexed

Sarah is out of options, on the run, pursued by deadly adversaries and desperate to find her daughter Kira.

Alison struggles with Aynsley's death and the trail to Kira leaves Sarah shocked.

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.

Sarah hits the road with Felix but she can't seem to escape her own past.

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 realises that no matter how far she runs, it will never be far enough.

Sarah's hunt for origins of the clone experiment leads her into deeper danger.

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.

Rachel goes on the warpath and an unexpected visitor threatens to derail Sarah's plans.

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.

Sarah joins forces with an untrustworthy ally and Cosima and Delphine make a discovery.

To Hound Nature in Her Wanderings

Sarah joins forces with an unlikely ally when she follows clues that she hopes will lead her to the origins of the experiment.

Alison's distraught when a confidante threatens to expose the truth about Aynsley's death.

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.

Felix goes into crisis mode when a new player in the clone conspiracy comes to his door.

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 weighs whether to surrender a crucial piece of leverage and make a deal with Dyad.

Sarah is forced to take desperate action when Cosima takes a turn for the worst.

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.

As the Clone Club fight for freedom, Sarah finds a terrifying dimension to the conspiracy.

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.

Sarah pursues the missing Helena who is held in a faraway compound.

The Weight of This Combination

Sarah tries to bluff a ruthless enforcer that all is well at the Dyad Institute, while Alison's family finances pose problems.

Castor pursues the Leda clones for original tissue samples.

Transitory Sacrifices of Crisis

More revelations about the ruthless Castor clones unsettle Sarah, though Seth manifests an intriguing genetic 'glitch'.

Mark and Gracie pursue new leads to find the samples that might set them free.

Formalised, Complex, and Costly

Mark is taken down in a Prolethean shoot-out and Sarah must step in to help.

Newer Elements of Our Defense

Sarah is caught between two 'brothers', while Alison meets a face from her past and Cosima is encouraged to look to the future.

Captive in the Castor compound, Helena prepares her escape. Cosima dares to go on a date.

Scarred by Many Past Frustrations

Paul digs and finds the ugly truth behind the Castor Boys' logbooks of names.

Certain Agony of The Battlefield

Cruel experimentation and a brutal confrontation in the Castor camp have bloody consequences.

Alison must secure a store front in order to take her business to the "next level".

Community of Dreadful Fear and Hate

Alison faces two tough opponents - a rival candidate and her own mother - during a fraught day of campaigning and conniving.

When Rachel makes a promise to Sarah, it comes with a hefty price.

Ruthless in Purpose and Insidious in Method

Some desperate schemes turn upon the use of unwitting clone Crystal and Cosima's lab assistant Scott.

Sarah, Felix, and Mrs. S take a trip with the hopes of tracking down the Castor Original.

Insolvent Phantom of Tomorrow

Sarah, Mrs S and Felix return to London seeking the 'Castor original' man with deadly intent. Helena has a violent answer to a family threat.

As Clone Club races towards the truth, Sarah is forced to make uneasy alliances.

History Yet to Be Written

The Leda ladies and their allies find crushing the Castor programme is the least of their tasks as showdowns violently unveil a deeper conspiracy.

After two months of respite, Sarah's hard-won peace in Iceland is shattered.

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 realises no matter how far her family runs it will never be far enough.

Sarah returns home to track down an elusive new ally.

Transgressive Border Crossing

After evading a Neolution attack in Iceland, Sarah returns home to track down an elusive new ally.

After the shocking discovery of Neolution's biotech, Sarah is desperate to find answers.

The Stigmata of Progress

As Sarah reels from the shocking discovery of Neolution's biotech, she's desperate to find answers.

Sarah realises her goals have aligned with her once enemy and forms a precarious alliance.

From Instinct to Rational Control

Sarah's day off to reconnect with Kira quickly turns into a sleuthing mission.

Human Raw Material

Sarah makes a lone decision that exposes Kendall to those she's spent years hiding from.

The Scandal of Altruism

Sarah struggles to cope with the consequences of her decisions.

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.

Sarah joins forces with Rachel to find a way to defeat their common foe.

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.

Sarah sets out to bring down Neolution once and for all.

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.

A wounded Sarah journeys into the island's interior.

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.

Sarah refuses to go along with Rachel's new regime.

Clutch of Greed

Dragged home from the Island by Neolution, Sarah refuses to go along with Rachel's new regime. With the help of an erstwhile ally, Sarah sets a plan in motion to get her and her daughter out of Neolution's reach for good.

Sarah gnaws at the shackles Rachel has firmly placed around her family.

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.

Sarah and Siobhan follow a lead on a Neolution defector.

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. Meanwhile, on the island, Cosima investigates rumours about a mysterious creature in the woods.

Sarah and Kira spend some well-needed bonding time at home.

Ease for Idle Millionaires

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

Cosima is forced into an alliance with Susan Duncan.

Manacled Slim Wrists

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

Rachel discovers a dark secret that makes her question her place within Neolution.

Gag or Throttle

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

Wounded and desperate, Rachel reunites with an old ally.

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.

Sarah is still reeling from the loss of Mrs. S when another blow lands.

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.

Now in labour, Helena has to hunker down in the basement of Old Dyad for the delivery.

To Right the Wrongs of Many

Now in labour, 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.

Orphan Black

Orphan Black

Series 4

1. The Collapse of Nature

1. The Collapse of Nature

2. Transgressive Border Crossing

2. Transgressive Border Crossing

3. The Stigmata of Progress

3. The Stigmata of Progress

4. From Instinct to Rational Control

4. From Instinct to Rational Control

5. Human Raw Material

5. Human Raw Material

6. The Scandal of Altruism

6. The Scandal of Altruism

7. The Antisocialism of Sex

7. The Antisocialism of Sex

8. The Redesign of Natural Objects

8. The Redesign of Natural Objects

9. The Mitigation of Competition

9. The Mitigation of Competition

10. From Dancing Mice to Psychopaths

10. From Dancing Mice to Psychopaths