Molly finally learns the frightening truth about what happened to her son. Also, Julie’s decision to erase Ethan’s memory has disturbing consequences.

Molly panics when she discovers she is changing physically – the question is into what, and whether she can reverse what’s happening to her. Also, JD’s ex-wife, Dorothy, shows up suddenly on his doorstep to discuss their daughter.

Molly and JD try to convince Shepherd to broker a peace between humans and hybrids. Meanwhile, Lucy tries to manipulate Charlie’s feelings to put him in a compromising position.

Molly tries to save her son following a raid on the hybrid compound and JD tries to rescue his daughter from Shepherd. Elsewhere, Lucy becomes a bigger threat to humans.