The BEST Episodes of Orphan Black

Every episode ever - ranked by fan votes!

Last Updated: Sep 6, 2020

Network: BBC America

A streetwise hustler is pulled into a compelling conspiracy after witnessing the suicide of a girl who looks just like her.

To Right the Wrongs of Many

#1 - To Right the Wrongs of Many

Season 5 - Episode 10 - Aired Aug 12, 2017

In the series finale, Helena prepares to deliver in the basement of Old Dyad while Sarah and Art fight to protect her from Neolution.

star 8.44
1,802 votes
Directors: John Fawcett
Writers: Graeme Manson, Renée St. Cyr
Endless Forms Most Beautiful

#2 - Endless Forms Most Beautiful

Season 1 - Episode 10 - Aired Jun 1, 2013

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.

star 8.41
4,159 votes
Directors: John Fawcett
Writers: Graeme Manson
History Yet to Be Written

#3 - History Yet to Be Written

Season 3 - Episode 10 - Aired Jun 20, 2015

As Clone Club races towards the truth, Castor and Topside force Sarah to make uneasy alliances. Meanwhile, Kendall may be the key to stop Castor; the sisters appear to be thwarting their most dangerous foe.

star 8.23
2,348 votes
Directors: John Fawcett
Writers: Graeme Manson
The Scandal of Altruism

#4 - The Scandal of Altruism

Season 4 - Episode 6 - Aired 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.

star 8.22
2,544 votes
Directors: Grant Harvey
Writers: Chris Roberts
Unconscious Selection

#5 - Unconscious Selection

Season 1 - Episode 9 - Aired May 25, 2013

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.

star 8.19
3,958 votes
Directors: T.J. Scott
Writers: Alex Levine
By Means Which Have Never Yet Been Tried

#6 - By Means Which Have Never Yet Been Tried

Season 2 - Episode 10 - Aired Jun 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.

star 8.17
3,149 votes
Directors: John Fawcett
Writers: Graeme Manson
Guillotines Decide

#7 - Guillotines Decide

Season 5 - Episode 8 - Aired Jul 29, 2017

The sisters take a night off to celebrate Felix's art opening. Wounded and desperate, Rachel reunites with an old ally, but their plans for revenge on Neolution put clone club in the line of fire.

star 8.14
1,853 votes
Directors: Aaron Morton
Writers: Aisha Porter-Christie, Graeme Manson
Gag or Throttle

#8 - Gag or Throttle

Season 5 - Episode 7 - Aired Jul 22, 2017

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

star 8.12
1,766 votes
Directors: David Frazee
Writers: Renée St. Cyr
The Mitigation of Competition

#9 - The Mitigation of Competition

Season 4 - Episode 9 - Aired Jun 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 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.

star 8.11
2,394 votes
Directors: David Frazee
Writers: Alex Levine
Entangled Bank

#10 - Entangled Bank

Season 1 - Episode 8 - Aired May 18, 2013

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.

star 8.11
4,060 votes
Directors: Ken Girotti
Writers: Karen Walton
From Dancing Mice to Psychopaths

#11 - From Dancing Mice to Psychopaths

Season 4 - Episode 10 - Aired Jun 16, 2016

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.

star 8.10
2,418 votes
Directors: John Fawcett
Writers: Graeme Manson
Conditions of Existence

#12 - Conditions of Existence

Season 1 - Episode 5 - Aired Apr 27, 2013

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.

star 8.08
4,488 votes
Directors: T.J. Scott
Writers: Alex Levine
Parts Developed in an Unusual Manner

#13 - Parts Developed in an Unusual Manner

Season 1 - Episode 7 - Aired May 11, 2013

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.

star 8.04
4,165 votes
Directors: Brett Sullivan
Writers: Tony Elliott
Variations Under Domestication

#14 - Variations Under Domestication

Season 1 - Episode 6 - Aired May 4, 2013

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.

star 8.03
4,350 votes
Directors: John Fawcett
Writers: Will Pascoe
Certain Agony of the Battlefield

#15 - Certain Agony of the Battlefield

Season 3 - Episode 6 - Aired 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.

star 8.03
2,308 votes
Directors: Helen Shaver
Writers: Aubrey Nealon
Insolvent Phantom of Tomorrow

#16 - Insolvent Phantom of Tomorrow

Season 3 - Episode 9 - Aired 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.

star 8.02
2,247 votes
Directors: Vincenzo Natali
Writers: Russ Cochrane
Things Which Have Never Yet Been Done

#17 - Things Which Have Never Yet Been Done

Season 2 - Episode 9 - Aired Jun 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.

star 7.99
3,076 votes
Directors: T.J. Scott
Writers: Alex Levine
One Fettered Slave

#18 - One Fettered Slave

Season 5 - Episode 9 - Aired Aug 5, 2017

As Sarah reels from a painful loss, she's dealt another blow: Helena has been kidnapped. The sisters band together in a race against time, determined to find Helena before an unmasked and unhinged John Mathieson lays hands on her babies.

star 7.99
1,795 votes
Directors: David Frazee
Writers: Alex Levine
Transgressive Border Crossing

#19 - Transgressive Border Crossing

Season 4 - Episode 2 - Aired Apr 21, 2016

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.

star 7.99
2,564 votes
Directors: John Fawcett
Writers: Russ Cochrane
Knowledge of Causes, and Secret Motion of Things

#20 - Knowledge of Causes, and Secret Motion of Things

Season 2 - Episode 7 - Aired May 31, 2014

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.

star 7.99
3,109 votes
Directors: Ken Girotti
Writers: Aubrey Nealon
Governed As It Were By Chance

#21 - Governed As It Were By Chance

Season 2 - Episode 4 - Aired 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.

star 7.96
3,114 votes
Directors: David Frazee
Writers: Russ Cochrane
Nature Under Constraint and Vexed

#22 - Nature Under Constraint and Vexed

Season 2 - Episode 1 - Aired 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.

star 7.95
3,953 votes
Directors: John Fawcett
Writers: Graeme Manson
The Redesign of Natural Objects

#23 - The Redesign of Natural Objects

Season 4 - Episode 8 - Aired Jun 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.

star 7.93
2,420 votes
Directors: Aaron Morton
Writers: Peter Mohan
Effects of External Conditions

#24 - Effects of External Conditions

Season 1 - Episode 4 - Aired Apr 20, 2013

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.

star 7.92
4,568 votes
Directors: Grant Harvey
Writers: Karen Walton
The Collapse of Nature

#25 - The Collapse of Nature

Season 4 - Episode 1 - Aired Apr 14, 2016

A flashback to Beth Childs' final investigation, days before her suicide.

star 7.91
2,743 votes
Directors: John Fawcett
Writers: Graeme Manson