As Westmoreland demands a more aggressive action on Kira, and Sarah fights to save her daughter, Rachel finds a dark secret that makes her question her place within Neolution. Elsewhere: Cosima returns with a vital clue to Westmoreland's true identity.

Cast: Tatiana Maslany, Jordan Gavaris, Kevin Hanchard, Kristian Bruun, Ari Millen, Josh Vokey, Maria Doyle Kennedy, Skyler Wexler, Matt Frewer, Stephen McHattie, Kyra Harper, Zoé De Grand Maison, Andrew Moodie, Calwyn Shurgold, Cynthia Galant