Two sniveling high school dropouts plot to rob the school janitor and accidentally release toxic chemicals into the school's water supply. The swimming team are the first ones to turn into green-faced flesh-eating zombies, and they promptly go after the rest of the present school populace: two horror movie nerds, the members of a metal band and the world's worst basketball team.

Four strangers are summoned to the basement of an abandoned house by a mysterious entity known only as The Sentinel. One after another, they are forced to witness heinous deeds they have yet to commit – and which will damn them for all eternity.

A man can't get to sleep and encounters various characters during his long fit of sleeplessness.