A marine biologist and a government agent investigate mysterious deaths and rumors of a sea monster in a secluded ocean cove, and find themselves involved with a marine biology professor conducting secretive experiments, international spies trying to steal his secrets, a radioactive light on the sea bottom, and the malevolent thing which guards it.

• Milner Brothers Productions
• Kent Taylor
• Cathy Downs
• Michael Whalen
• Rodney Bell
• Phillip Pine
• Vivi Janiss
• Helene Stanton
• Pierce Lyden