Bat Masterson, frequent target of gunfights, falls into the sights of Dodge City's largest saloon's trigger man. The saloon owner fears that Bat plans to seek revenge and decides to eliminate him.
Playboy sportsman Elliot Conway and his wife Gloria employ Mike Nelson to teach them skin-diving and guide their underwater 'safari' for sharks in the waters off Peru. Mike fights a school of hungry sea beasts to save the lives of his 'pupils.'
Latin American revolutionists seek Mike's help in overthrowing their country's ruthless dictator. They ask him to recover the body of the dictator's murdered opponent from the bottom of the palace lagoon to spark a full-scale revolt
