Stolen from Wiki (http://en.wikipedia.org/wiki/The_Walking_Dead_%28TV_series%29)
Based on the comic book series of the same name, The Walking Dead tells the story of a small group of survivors living in the aftermath of a zombie apocalypse. Most of the story takes place in the Atlanta metropolitan area, and then the surrounding countryside, as the survivors search for a safe haven away from the shuffling hordes of predatory zombies (or “walkers”, as they are referred to in show) who devour any living thing they catch, and whose bite is infectious to humans. The plot is focused primarily on the dilemmas the group faces as they struggle to balance their humanity with their survival against the zombie horde, and later, how they cope with members being killed and deal with other human survivors they encounter, many of whom are dangerous and predatory themselves.
The group is led by Rick Grimes, who was a sheriff’s deputy before the zombie outbreak. At every turn they are faced with the horror of the dead walking again, the changing dynamic of their group, and hostility from the scattered remains of a struggling human populace who are focused on their own survival now that the structures of society have collapsed.