When a seawood-strewn sea monster begins offing sun-kissed beach beauties and their beaus down in Malibu, professor Otto Lindsay (Jon Hall, who also directs) suspects the culprit is a genetically mutated fish. But when the creature appears to strike with an intentional strategy, Lindsay wonders if a madman is behind the killings instead. This campy drive-in surf-movie romp also stars Sue Casey, Arnold Lessing and Walker Edmiston.