Zombie king George A. Romero returns with a fourth gruesome tale of the walking dead -- and this time, they've taken over the planet. Humans have lost the battle against the flesh eaters, and are barricaded in a walled city ruled by ruthless despots. When the zombies develop advanced military tactics, it's up to a group of mercenaries to save the living. Dennis Hopper, Simon Baker, John Leguizamo and Asia Argento star.