In a post apocalyptic world, undead zombies rule the land, with pockets of humans managing to live in fortified cities protected by heavily armed soldiers. And within those, there are the haves and have-nots, where the likes of corrupt businessman Kaufman (DENNIS HOPPER) have their hands in everything and look down on the less fortunate survivors as lower-class citizens.
He utilizes a bunch of mercenaries -- including leader Riley (SIMON BAKER) and his sidekick Charlie (ROBERT JOY), as well as the number two man Cholo (JOHN LEGUIZAMO) and his team members such as Foxy (TONY NAPPO) -- to make supply raids in the unprotected, outside environs where ordinary fireworks distract the zombies -- such as Number 9 (JENNIFER BAXTER) and Butcher (BOYD BANKS) -- while the humans get what they need.
Riley has recently rescued hooker Slack (ASIA ARGENTO) from several zombies but dreams of getting far away from all of the mayhem. That's a sentiment shared by Cholo who's hoping to cash in his favors to Kaufman in exchange for a spot in the gated high-rise known as Fiddler's Green. When Kaufman rebukes him, Cholo decides to take his boss's heavily armored transport vehicle and get his revenge, prompting the corrupt leader to send Riley and his team to find and stop Cholo.
As all of that unfolds, the various humans must deal with the discovery that one of the zombies, Big Daddy (EUGENE CLARK), seemingly is trying to organize the other "walkers" into a unified strike on the humans. As the undead then make their way toward the city and Fiddler's Green, the humans try to stop the assault and avoid being turned into zombies themselves.