Athena (Carrie-Anne Moss) travels to the UK and her tragic secret is revealed. Niska’s (Emily Berrington) consciousness assessments begin. With more time at home Joe (Tom Goodman-Hill) notices Sophie’s (Pixie Davies) increasingly eccentric behaviour. As Karen (Ruth Bradley) returns to work with Pete (Neil Maskell), cracks start appearing in their relationship. The Synths are forced to leave their hideout but Mia (Gemma Chan) shocks them with a huge decision.