 A nerdy highschool super whiz experiments with a chemical which will transform his guinea pig "Mr. Mumps" from a gentle pet into a ravenous monster. In a fit of rage against his tormenters at the highschool, Vernon Potts (Pat Cardi) goes on a killing spree, eliminating all of those who ever picked on him - the Gym Coach, the School Jock, The Creepy Janitor(Mr. Griggs)& his hated teacher,Mrs Grindstaff. In the end he gets the jock s girlfriend for himself but his happiness is shortlived as the potion turns him into a monster hunted by the towns lame police Leuitenent - Bosman