The BEST Episodes of Orphan Black

Every episode ever - ranked by fan votes!

Last Updated: Aug 10, 2019

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

Endless Forms Most Beautiful

#1 - Endless Forms Most Beautiful

Season 1 - Episode 10

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 8.55
2,542 votes
Directors: John Fawcett
Writers: Graeme Manson
To Right the Wrongs of Many

#2 - To Right the Wrongs of Many

Season 5 - Episode 10

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 8.49
1,553 votes
Directors: John Fawcett
Writers: Graeme Manson, Renée St. Cyr
By Means Which Have Never Yet Been Tried

#3 - By Means Which Have Never Yet Been Tried

Season 2 - Episode 10

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 8.40
2,232 votes
Directors: John Fawcett
Writers: Graeme Manson
Unconscious Selection

#4 - Unconscious Selection

Season 1 - Episode 9

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 8.31
2,439 votes
Directors: T.J. Scott
Writers: Alex Levine
History Yet to Be Written

#5 - History Yet to Be Written

Season 3 - Episode 10

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.

star 8.27
1,910 votes
Directors: John Fawcett
Writers: Graeme Manson
The Scandal of Altruism

#6 - The Scandal of Altruism

Season 4 - Episode 6

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 8.26
2,225 votes
Directors: Grant Harvey
Writers: Chris Roberts
Entangled Bank

#7 - Entangled Bank

Season 1 - Episode 8

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 8.24
2,468 votes
Directors: Ken Girotti
Writers: Karen Walton
Guillotines Decide

#8 - Guillotines Decide

Season 5 - Episode 8

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 8.17
1,608 votes
Directors: Aaron Morton
Writers: Aisha Porter-Christie, Graeme Manson
Things Which Have Never Yet Been Done

#9 - Things Which Have Never Yet Been Done

Season 2 - Episode 9

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 8.16
2,159 votes
Directors: T.J. Scott
Writers: Alex Levine
Knowledge of Causes, and Secret Motion of Things

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

Season 2 - Episode 7

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 8.15
2,188 votes
Directors: Ken Girotti
Writers: Aubrey Nealon
Conditions of Existence

#11 - Conditions of Existence

Season 1 - Episode 5

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 8.15
2,621 votes
Directors: T.J. Scott
Writers: Alex Levine
Variations Under Domestication

#12 - Variations Under Domestication

Season 1 - Episode 6

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 8.14
2,556 votes
Directors: John Fawcett
Writers: Will Pascoe
Gag or Throttle

#13 - Gag or Throttle

Season 5 - Episode 7

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 8.14
1,548 votes
Directors: David Frazee
Writers:
Parts Developed in an Unusual Manner

#14 - Parts Developed in an Unusual Manner

Season 1 - Episode 7

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 8.14
2,496 votes
Directors: Brett Sullivan
Writers: Tony Elliott
Certain Agony of the Battlefield

#15 - Certain Agony of the Battlefield

Season 3 - Episode 6

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 8.11
1,891 votes
Directors: Helen Shaver
Writers: Aubrey Nealon
From Dancing Mice to Psychopaths

#16 - From Dancing Mice to Psychopaths

Season 4 - Episode 10

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.

star 8.11
2,131 votes
Directors: John Fawcett
Writers: Graeme Manson
Governed As It Were By Chance

#17 - Governed As It Were By Chance

Season 2 - Episode 4

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 8.11
2,248 votes
Directors: David Frazee
Writers: Russ Cochrane
The Mitigation of Competition

#18 - The Mitigation of Competition

Season 4 - Episode 9

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 8.09
2,087 votes
Directors: David Frazee
Writers: Alex Levine
Nature Under Constraint and Vexed

#19 - Nature Under Constraint and Vexed

Season 2 - Episode 1

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 8.09
2,649 votes
Directors: John Fawcett
Writers: Graeme Manson
One Fettered Slave

#20 - One Fettered Slave

Season 5 - Episode 9

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 8.06
1,549 votes
Directors: David Frazee
Writers: Alex Levine
Insolvent Phantom of Tomorrow

#21 - Insolvent Phantom of Tomorrow

Season 3 - Episode 9

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 8.04
1,808 votes
Directors: Vincenzo Natali
Writers: Russ Cochrane
Ipsa Scientia Potestas Est

#22 - Ipsa Scientia Potestas Est

Season 2 - Episode 5

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.

star 8.02
2,230 votes
Directors: Helen Shaver
Writers: Tony Elliott
Effects of External Conditions

#23 - Effects of External Conditions

Season 1 - Episode 4

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 8.01
2,718 votes
Directors: Grant Harvey
Writers: Karen Walton
To Hound Nature in Her Wanderings

#24 - To Hound Nature in Her Wanderings

Season 2 - Episode 6

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.

star 8.01
2,239 votes
Directors: Brett Sullivan
Writers: Chris Roberts
Ruthless in Purpose, and Insidious in Method

#25 - Ruthless in Purpose, and Insidious in Method

Season 3 - Episode 8

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.

star 7.98
1,782 votes
Directors: Aaron Morton
Writers: Graeme Manson, Chris Roberts