Following the sighting of a helicopter and an encounter with a family who have put themselves in isolation the group links up with Samantha Willis and her community. Initially she and Abby get on well and she asks Abby to stay but Abby is unhappy at the other woman's ruthless attitude and besides, she needs to press on and look for her son, Peter. In a laboratory in Samantha's complex scientists are trying to develop a vaccine for the killer virus.
Stars: Julie Graham, Robyn Addison, Nikki Amuka-Bird
Director(s): Andrew Gunn
Writer(s): Adrian Hodges, Terry Nation, Gaby Chiappe