All 16 episodes from the fourth season of the us zombie adventure drama based on the comic books by robert kirkman when police officer rick grimes andrew lincoln wakes from a coma to find the world in the grip of a zombie epidemic he joins a small encampment on the outskirts of atlanta where a band of human survivors struggle to withstand the terrifying advances of the walking dead in this season the entire population of the prison is put in grave danger when a mystereious virus hits and