Teen skater Ken Park (nicknamed Krap Nek; his name spelled and pronounced backward) kills himself at a Visalia skate park; his death bookends the lives of four other young people who knew him: Shawn, the most conventional; Tate brims with psychotic rage; Claude is habitually harassed by his brutish father and coddled, rather uncomfortably, by his enormously pregnant mother; and Peaches looks after her devoutly religious father, but yearns for freedom. They're all rather tight, or so they claim.

In a post-apocalyptic future mankind is lives in a prehistoric manner. After killing his father for sexually assaulting his girlfriend, the son of a tribal leader runs away with a group of his teenage friends. They are taken in by Neil and Judith who introduce them to the vices outlawed by their tribes namely sex and drugs.Neil and Judith, however, are genetically altered indestructible mutants who have their own plans for the future of the human race.