In 1977 a group of young, horny, out of control Christians are spending a fun filled weekend at the Happy Day Bible Camp. Their impure antics rile up a sadistic crazy nun known as, "Sister Mary Chopper". One by one these youthful sinners pay a BLOODY penance for their sinful acts. 7 years later, another group of Bible totin' Christian wannabes return to the Happy Day Bible Camp. All ignore the warnings from the local folk of the grizzly murders that took place 7 years prior. Is Sister Mary Chopper dead or is she just waiting for backsliding Christians to commit sins of the unholy?

Ken is a wandering and unassuming serial killer who enters a forsaken and empty diner during the graveyard shift. After a long conversation with the diner's lone waitress Rose, Ken kills her and promptly delivers the same fate to the diner's cook Fred. As Ken cleans up the bloody mess and deposits Rose and Fred in the walk-in freezer, company arrives. A young, unhappy married couple Rob and Kathy stop by the diner only to be followed by the arrival of Sheriff Duke Purdett. Ken now finds himself in the middle of a rousing game of cat and mouse which he manages well until the unthinkable happens. Back from the dead, Rose and Fred emerge from the freezer and start walking around! Once an unflappable serial killer, Ken now holds the young couple and wounded sheriff captive, trying frantically to escape the zombie predators.