Kevin (Bill Calvert), Steve (Brian Robbins), and Katie (Tricia Leigh Fisher) are an inseparable trio of friends doing some Bud the Chud extracurricular snooping in the school science lab when, among the test tubes and beakers, they discover a corpse! But before they can say "Abra Cadaver", the body disappears, rolling down Route 51 strapped to a gurney. The kids need a spare stiff, and fast. What they find is "Bud the Chud", a half-dead decomposing humanoid, the result of a military experiment gone haywire. When Bud sets out on a killing spree, the kids, the Army, the police, and the FBI are hot on his trail, trying to save the entire town from becoming "Chudified!"