A young girl is killed at the beach in Malibu. Professor Otto Lindsay suspects that it is some form of mutated fish. However, his son Richard, who was a good friend of the girl, thinks that it is a madman who has a grudge against Richard and his friends. Soon the list of victims grows.
| Actor | Role |
|---|---|
 Jon HallDr. Otto Lindsay | Dr. Otto Lindsay |
 Sue CaseyVicky Lindsay | Vicky Lindsay |
| EElaine DuPontJane | Jane |
| AArnold LessingRichard Lindsay | Richard Lindsay |
 Read MorganSheriff Michaels | Sheriff Michaels |
| CCarolyn WilliamsonSue | Sue |
| GGloria NeilBunny | Bunny |
| KKal RobertsBrad | Brad |
| CClyde AdlerDeputy Scott | Deputy Scott |
 Walker EdmistonMark | Mark |