When a postmortem finds that a murdered fisherman was exposed to
unusual amounts of radiation, Dr. Ted Stevens (Kent Taylor) decides to
investigate. Out looking for clues, he meets a young beauty named Lois
(Cathy Downs), whose father, Professor King (Michael Whalen), runs a
local marine biology lab. Ted discovers that the
elder King's secret experiments with atomic energy have resulted in the
creation of a murderous aquatic beast, and he must act fast to prevent
more needless deaths.
