Tom returns to the group with supplies, having seen gun-wielding men in gas masks round up other survivors into a van marked PSJ Laboratories, where Abby is being held and to which they travel. Whitaker has Abby re-injected with the virus to see how she survived, in order to make the cure. Once again she survives. Whitaker's wife, whom he has kept hidden until a cure is found, accidentally stumbles on Abby and other guinea pigs and is horrified. She cannot save the other captives but releases Abby,who returns to her friends.
Stars: Chahak Patel, Julie Graham, Geraldine Somerville
Director(s): Jamie Payne
Writer(s): Adrian Hodges, Terry Nation, Gaby Chiappe