Story follows a stagecoach ride through Old West Apache territory. On board are a cavalry man's pregnant wife, a prostitute with a broken heart, a Marshal taking in his prisoner Johnny Ringo, a crooked gambler, and the infamous Doc Holliday

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.