Cosima takes a bad turn; Sarah takes action with tragic consequences; the Proletheans set their plan in motion; Alison and Donnie have a run-in with the law.
Cast:

Tatiana Maslany

Dylan Bruce

Jordan Gavaris

Kevin Hanchard

Evelyne Brochu

Maria Doyle Kennedy

Michael Mando

Michelle Forbes

Peter Outerbridge

Kristian Bruun

Inga Cadranel

Josh Vokey

Julian Richings

Ari Millen