Episode list

Fiona Douglas is the sole survivor in the lab, working on a cure. She tells Abby that Peter,immune like his mother, had been to the lab with Whitaker but both had left. She does not know who Landry, the man with whom Whitaker communicates, is but believes she has perfected a serum,which is successfully tested on Al.Whitaker has hidden Peter in a caravan park,telling him to shoot strangers and the boy kills Fiona. Whitaker takes him to the airfield to give to Landry - whose company accidentally caused the virus, but the survivors follow and Peter is exchanged for the serum after Whitaker is shot dead. Landry flies off,promising to mass-produce the serum,unaware that he has a stowaway on board.

When the group's Land Rover breaks down they are helped out by wheeler-dealer Billy, who knows everyone - including Samantha, to whom he betrays their position.She has Tom put on trial for killing her man Gavin and it comes out that he was originally in prison for committing a double murder during a robbery. Samantha says she will release him if he kills Dexter, who is becoming a liability to her. He does so but she reneges, sending both him and Greg to become slave labour in coal mines owned by Smithson, a friend of the duplicitous Billy.

Greg follows a clue as to where his wife may have gone,to an airfield used to ferry out plague survivors. Here Mr.Stevens,who missed the plane and went mad, kills himself. The rest of the group encounter a commune of survivors,living an idyllic self-sufficient life-style,but a mutant strain of the virus hits one of the families,and Sarah,who has quarantined herself in their house to prevent contagion,dies with them.Abby burns the house and the outbreak - spread by birds according to Tom - is contained. Leaving Sally with the commune the other survivors go to Whitaker's lab,where Abby intends to find a cure on her own terms, but the doors are wide open, the trial patients dead and Whitaker is escaping with Peter.

The group is forced to leave their country house headquarters when Sarah betrays the fact that Anya is a doctor and Tom kills one of Samantha's men. They relocate to the city where Naj gets lost and is eventually found,having been taken in by Craig, a sort of Fagin figure who, with his partner June, gives boys a home in exchange for what they can scavenge. The other survivors take Naj from Craig but are ultimately tracked down by Samantha's people in a rooftop car park where Greg is shot and Abby is captured and driven away.

The family attempts to free captives Tom and Greg from Mr. Smithson's Coal Mine.

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.

A mysterious virus kills most of the world. In England Abby Grant finds herself immune but her husband dead. She determines to set out and find her son Peter, last known holidaying in the Peak District,and on the motorway meets the practical Greg Preston. Tom Price, a convict serving life for murder, kills the only other prison survivor, a warder,and escapes, meeting Anya, a hospital doctor who has seen friends and patients alike die. Al, a wealthy young man, also survives, 'adopting' Najid, an eleven year old orphan. The group ultimately come together whilst Samantha Willis, the only government minister to survive, forms a small caucus in a germ-free complex, killing anyone who may be infected to tries to get in but having to admit the thuggish Dexter as her right hand man.

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.

The group set up camp in a big house from where they send out a scavenger party to a supermarket but are forced to withdraw by another, armed, group. Abby believes one of the men may have information about her son but she gets no joy. Greg, meanwhile, comes across a warehouse full of food and a couple, Sarah and the injured Bob.

Abby is taken to a sealed bio-dome where scientist Fiona Douglas tries to find out how she caught the virus but survived. James Whitaker tells her her cooperation is crucial but he is a liar who says his wife and child are dead whilst he is secretly hiding them. Anya and Al are trapped under rubble in a decaying hospital where they have gone for her to operate on Greg. They survive when Sarah agrees to have sex with a man who will help them and Anya removes the bullet from Greg, who then denounces Tom as a murderer,causing Tom to leave the group.