Fourth instalment in director George A. Romero's zombie sequence. With the living dead having now taken over much of the world, the few survivors left have retreated to a fortified city, where the rich live in penthouse apartments while the poor suffer on the streets below. Governed by the corrupt Kaufman (Dennis Hopper), the city comes under threat when the impoverished population begin to demand a change in leadership and it becomes obvious that the army of zombies outside the city walls is beginning to adapt to its surroundings.