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Season guide

Orphan Black: Season 3

10 episodes Premiered Apr 18, 2015
Previously on Orphan Black

Season 3 Lore Primer

Key plot threads, lore context, and character stakes you need to remember before diving into this season.

  • Directly follows the overarching narrative developments of Orphan Black Season 2.
  • Faction dynamics and core character alliances shift under escalating external stakes.
  • Crucial mysteries introduced previously reach key turning points and narrative reckonings.
  • Sets up serialized story arcs that build directly toward the climactic season finale.
Season 3 Episodes

Episode Guide

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Season 3 Progress Shield

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Binge Efficiency Engine

Season 3: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

30%
70%
Mytharc (3): Crucial lore & season climaxes
Core (7): Character development & subplots
Side Quest (0): Standalone / filler
S3·E1 Mytharc

The Weight of This Combination

Apr 18, 2015

When the menace of Castor rears its head once more, Sarah and her entire family must come together to survive.

S3·E2 Core

Transitory Sacrifices of Crisis

Apr 25, 2015

Castor pursues the Leda clones for original tissue samples. Helena, who is pregnant and imprisoned, is examined by a mysterious new villain. The Castor boys are also out to play, t

S3·E3 Core

Formalized, Complex, and Costly

May 2, 2015

Leda and Castor are both on the hunt for original clone DNA. On-the-lam, Mark and Gracie pursue new leads to find the samples that might set them free, while Art and Sarah reunite

S3·E4 Core

Newer Elements of Our Defense

May 9, 2015

Mark is taken down in a Prolethean shoot-out and Sarah must step in to help. But as Sarah gathers intel that puts her on the trail of the original Castor DNA, a familiar foe is not

S3·E5 Core

Scarred by Many Past Frustrations

May 16, 2015

Helena and Sarah are reunited at the Castor camp. As Sarah suffers testing, Paul appears to chide her; but his allegiances are beginning to strain. While the Leda family worries ab

S3·E6 Core

Certain Agony of the Battlefield

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 th

S3·E7 Core

Community of Dreadful Fear and Hate

May 30, 2015

Alison must secure a store front in order to take her and Donnie’s business to the “next level”. But things don’t go according to plan when her mother, Connie, proves to be a major

S3·E8 Core

Ruthless in Purpose, and Insidious in Method

Jun 6, 2015

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 a

S3·E9 Mytharc

Insolvent Phantom of Tomorrow

Jun 13, 2015

Sarah, Felix, and Mrs. S are in London to track down the Castor Original, but their enemies are not far behind.

S3·E10 Mytharc

History Yet to Be Written

Jun 20, 2015

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