Pilot episode. England is hit by a massive epidemic as Cris and his girlfriend are forced to leave their home. 10 months on Cris is alone in the wilderness trying to survive, but he's not the only one.
Cris has to fight with his conscience as he must decide to do the right thing or remain alone. Meanwhile Jack makes a decision that will seal his fate.
The season finale as Alex begins to hunt down Cris and Zoe after the death of one of his men. Cris finally reveals to Zoe about the fate of his lost girlfriend Angela.