Mad World episode 1 "Autumn" follows the initial outbreak of a new and mysterious pathogen that radically changes the behaviour of the host, before ultimately leading to death.
Ryan has been surviving in the wilderness for months, battling the cold winter. Supplies are short and he must make the decision to enter the dangerous towns where the infected run wild and the authorities execute anyone on site.
Ryan and Beth are being held captive by a mysterious group. Starved, beaten and tormented for weeks by their sadistic captors, they have only one hope. That Nathan finds them before it's too late.
One year on from the tragic events that took place in summer. The group hears of a safe zone free of infection located in the Peak District. They must make their way across miles of dangerous country whilst dealing with the anarchy of the insane group that won't stop hunting them.