Sarah strives to rescue Cosima while struggling to survive on the island herself. Elsewhere: Cosima reunites with Delphine.

Cast: Tatiana Maslany, Jordan Gavaris, Kevin Hanchard, Kristian Bruun, Ari Millen, Josh Vokey, Maria Doyle Kennedy, Evelyne Brochu, Skyler Wexler, Ron Lea, Jenessa Grant, Elyse Levesque, Géza Kovács, Andrew Moodie, Cynthia Galant