A nerdy high school 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 tormentors at the high school, Vernon Potts goes on a killing spree, eliminating all of those who ever picked on him - the Gym Coach, the School Jock, The Creepy Janitor & his hated teacher, Ms. Grindstaff.
| Actor | Role |
|---|---|
 Pat CardiVernon Potts | Vernon Potts |
 Austin StokerLieutenant Bozeman | Lieutenant Bozeman |
| RRosie HolotikRobin Jones | Robin Jones |
| JJohn NilandCoach McCall | Coach McCall |
| JJoye HashMiss Grindstaff | Miss Grindstaff |
 Jeff AlexanderMr. Griggs | Mr. Griggs |
| MMike McHenryRoger Davis | Roger Davis |
 Joe GreeneCoach's Buddy / Policeman | Coach's Buddy / Policeman |
| NNick FelixMr. Henshaw | Mr. Henshaw |
| MMichelle FalerneGirl-Student | Girl-Student |
| LLaura WilliamsonNurse | Nurse |
| CCharles MannSchool Principal | School Principal |