 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 girl, thinks that it is a madman who has a grudge against Richard and his friends. Soon the list of victims grows to include one of Rich s surfing buddies, Rich s bitchy stepmother Vicky and his friend Mark who was crippled in an auto accident.