Athena travels to the UK and her tragic secret is revealed. Niska's consciousness assessments begin. With more time at home Joe notices Sophie's increasingly eccentric behaviour. As Karen returns to work with Pete, cracks start appearing in their relationship. The Synths are forced to leave their hideout but Mia shocks them with a huge decision.
Casts:
Katherine Parkinson, Gemma Chan, Emily Berrington, Lucy Carless, Colin Morgan, Theo Stevenson, Pixie Davies, Tom Goodman-Hill, Ivanno Jeremiah, Ruth Bradley, Billy Jenkins, Ukweli Roach, Dino Fetscher, Mark Bonnar, Holly Earl