Controlling Evolution - Orphan Black
Watch Orphan Black Season 4 Episode 10
"From Dancing Mice to Psychopaths"
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On Orphan Black Season 4 Episode 10, Cosima is cut off from communication and Neolution moves in, as the alliance between Sarah and Rachel shatters.

Sarah's New Situation - Orphan Black
Watch Orphan Black Season 4 Episode 9
"The Mitigation of Competition"
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On Orphan Black Season 4 Episode 9, Sarah finds she's under the heel of a new HBIC and with Susan Duncan deposed, archenemies come together for the greater good.

Donnie Is Threatened - Orphan Black
Watch Orphan Black Season 4 Episode 8
"The Redesign of Natural Objects"
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On Orphan Black Season 4 Episode 8, Siobhan sneaks out to seek vengeance while Sarah is distracted and Alison is terrified by threats made against Donnie.

Old Habits - Orphan Black
Watch Orphan Black Season 4 Episode 7
"The Antisocialism Of Sex"
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On Orphan Black Season 4 Episode 7, Cosima attempts a Hail Mary back at the lab while Sarah falls back on old habits in order to cope with her decisions.

Krystal Needs Protecting - Orphan Black
Watch Orphan Black Season 4 Episode 6
"The Scandal of Altruism"
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On Orphan Black Season 4 Episode 6, Sarah makes a drastic decision that might expose Kendall to the people she has been trying to hide from.

A Sleuthing Mission - Orphan Black
Watch Orphan Black Season 4 Episode 5
"Human Raw Material"
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On Orphan Black Season 4 Episode 5, after reconnecting with Kira, Sarah has a sleuthing mission with the goal of discrediting Felix's new ties.

Forming New Alliances - Orphan Black
Watch Orphan Black Season 4 Episode 4
"From Instinct To Rational Control"
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On Orphan Black Season 4 Episode 4, Sarah begins to form an alliance with a former enemy in the hope of getting to the head of Neolution.

A Traumatic Encounter - Orphan Black
Watch Orphan Black Season 4 Episode 3
"The Stigmata of Progress"
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On Orphan Black Season 4 Episode 3, Sarah investigates a shocking discovery of Neolution's biotech and ends up having a traumatic encounter.

The Next Aspect - Orphan Black
Watch Orphan Black Season 4 Episode 2
"Transgressive Border Crossing"
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On Orphan Black Season 4 Episode 2, Sarah uncovers the next aspect of the Neolution's agenda while tracking down an elusive new ally.

On the Run - Orphan Black
Watch Orphan Black Season 4 Episode 1
"The Collapse of Nature"
Original Air Date:

On Orphan Black Season 4 Episode 1, Sarah's refuge in Iceland is destroyed when Neolution attacks and she is forced to flee once again in the season premiere.