The Arizona Territory, the 1870's. Marshal Frank Wilcox, along with a Buffalo Soldier from the U.S. Army, must galvanize a group of survivors to fight back when the living dead rise and seek the flesh of the living. It's a world gone mad and a battle against the unthinkable. Joined by an Apache Chief and an outlaw prisoner, the group must learn how to survive in a time where the dead walk.

Nailgun is a struggling heavy metal band that seems to never get the break they think they deserve thanks to the endlessly bad decision making by their fearless leader, Melvin. The band is ready to call it quits when Melvin steals a magical microphone forged by Satan that grants the wishes to anyone who sings through it. By not sharing the power of the microphone with his bandmates, Nailgun accidentally triggers the apocalypse. Now Melvin must figure out a way to beat Satan at his own game in order to save the planet.