Melvin White, a neurotic, accident-prone cop who gets demoted to the night shift, secretly moonlights as the Unknown Comic, an anonymous stand-up comedian who performs with a paper bag over his head. When someone using the same guise commits a string of bar robberies in town, some begin to suspect that White is the culprit.

Danny Warren is a former minor-league shortstop that becomes a narc to uncover drug dealing in this situation comedy. Investigating at a high-school adult-education class, he falls for the tempting teacher. He joins a colorful group of characters that includes ex-cons, illegal aliens, and brain-dead baby boomers that cause more trouble than their younger counterparts. Swimming classes and wine tastings serve as background for a series of comic catastrophes.

Toxic waste dumping in a small Idaho town turns a young boy into horrible mutant monster. The town's police chief and a government scientist team up to stop the monster, which is quickly killing off the town's citizenry.