Herman Umgar is a worm-breeder whose behavior is more than a little on the odd side. He likes to sneak worms into people's food just to upset everyone and watch the "fun." Unfortunately, Herman owns half of the town. His father was killed in 1939 by the father of the current mayor, who would love to have Herman committed and take over the town himself. While this political scenario is brewing, Herman's hijinks escalate into a real problem. After he hides a worm in a plate of spaghetti, the woman who eats it mutates into a half woman, half worm creature, and before long several such worm-like mutants are showing up around town. .