The BEST Episodes of Orphan Black
Every episode ever - ranked by fan votes!
Last Updated: May 17, 2021
Network: BBC America
A streetwise hustler is pulled into a compelling conspiracy after witnessing the suicide of a girl who looks just like her.
#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.
8.43 
#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.
8.40 
#3 - 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.
8.23 
#4 - 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.
8.23 
#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.
8.18 
#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.
8.17 
#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.
8.14 
#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.
8.12 
#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.
8.10 
#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.
8.10 
#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.
8.09 
#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.
8.07 
#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.
8.03 
#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.
8.03 
#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.
8.02 
#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.
8.02 
#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.
7.99 
#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.
7.98 
#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.
7.98 
#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.
7.98 
#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.
7.96 
#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.
7.95 
#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.
7.93 
#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.
7.92 
#25 - The Collapse of Nature
Season 4 - Episode 1 - Aired Apr 14, 2016
A flashback to Beth Childs' final investigation, days before her suicide.
7.90