Synopsis by Bruce Eder
A series of mysterious deaths of fishermen and swimmers along a stretch of beach attract the attention of scientist Dr. Ted Stevens (Kent Taylor) and government investigator William Grant (Rodney Bell) -- they both want to know why the victims and their boats all show signs of exposure to atomic radiation, and if there's a connection between the deaths and the nearby Pacific College of Oceanography, run by Professor King (Michael Whalen); and they're also interested in why King's assistant, George Thomas (Phillip Pine), is always lurking around the beach, often armed with a spear gun. Stevens establishes a friendship with King's daughter Lois (Cathy Downs) that turns to romance, but he's principally concerned with finding out about an apparent source of radiation on the ocean floor, and what its connection might be with the unearthly sea creature rumored to be stalking that section of the beach. Helene Stanton hangs around in a fairly revealing (for the time) bathing suit, waiting on the beach for some top-secret information, and Vivi Janiss overacts nicely as a woman with too much on her mind for her own good.
sea-monster, monster, mutant, creature, death, giant, investigator, mad-scientist, mystery [unexplained phenomenon], oceanography, radiation, sea, underwater, attack, energy, uranium, evil, explosion