Orphan Black

10 Best Episodes of Orphan Black - Season 4

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

Written by Sophie and last updated on feb 02, 2023.

PS: The following content contains spoilers!

PPS: I will admit that parts of this page was written with the help of AI - it makes my work so much easier to not start from a blank page!

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Orphan Black - S4E7

#10 - The Antisocialism of Sex (Season 4 - Episode 7)

Sarah regresses back 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.

The episode was rated 7.80 from 2144 votes.

Orphan Black - S4E4

#9 - From Instinct to Rational Control (Season 4 - Episode 4)

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Sarah forms an alliance with a former enemy in hopes of getting to the head of Neolution. Elsewhere, Allison orders Felix and Donnie to invade a Neolution fertility clinic and Susan Duncan leaves Rachel to make a devastating decision.

The episode was rated 7.81 from 2187 votes.

Orphan Black - S4E3

#8 - The Stigmata of Progress (Season 4 - Episode 3)

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

The episode was rated 7.82 from 2261 votes.

Orphan Black - S4E5

#7 - Human Raw Material (Season 4 - Episode 5)

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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.

The episode was rated 7.89 from 2172 votes.

Orphan Black - S4E1

#6 - The Collapse of Nature (Season 4 - Episode 1)

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

The episode was rated 7.90 from 2474 votes.

Orphan Black - S4E8

#5 - The Redesign of Natural Objects (Season 4 - Episode 8)

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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.

The episode was rated 7.90 from 2150 votes.

Orphan Black - S4E2

#4 - Transgressive Border Crossing (Season 4 - Episode 2)

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.

The episode was rated 7.93 from 2323 votes.

Orphan Black - S4E9

#3 - The Mitigation of Competition (Season 4 - Episode 9)

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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.

The episode was rated 8.08 from 2126 votes.

Orphan Black - S4E10

#2 - From Dancing Mice to Psychopaths (Season 4 - Episode 10)

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.

The episode was rated 8.11 from 2175 votes.

Orphan Black - S4E6

#1 - The Scandal of Altruism (Season 4 - Episode 6)

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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.

The episode was rated 8.25 from 2274 votes.

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