Suave, silver-haired stage hypnotist and self-proclaimed clairvoyant and expert on reincarnation Dr. Basso's experiments in hypnotic regression take his beloved beautiful blonde assistant/unwilling test subject Doreena back to a prehistoric past life as an amphibious humanoid 'Gill Monster'.
[3] Using the entranced Doreena to summon the physical manifestation of the hideous fish-faced creature out of the depths of a nearby lake, the tuxedo and top hat-clad Basso commands the savage she-beast to commit brutal murders.
Partially for revenge on a world which scoffed at his strange occult theories and unshakable belief that mindlessly destructive primeval monsters still lurk hidden deep within all of us; but mostly for the notoriety they bring his performances when he predicts the killings before they happen.
Handsome young Air Force psychologist Captain Ted Dell, a respected scientist in the field of psychic research, gets involved in the case when his fiancée Lynn drags him to a party her father, retired business tycoon Sam Crane, is putting on for the rich guests at his Tanglewood Country Club and Resort where Basso is providing the entertainment.
[6] Because of the movie's bargain basement budget, Buchanan could not afford anything as ornately bizarre and iconic as Paul Blaisdell's design for the original She Creature, so his Gill Monster costume, created by Dallas advertising executive turned makeup effects artist Jack Bennett, consisted of an ill-fitting and only slightly modified green rubber wetsuit and a cheap-looking fanged and finned, ping pong ball-eyed fish mask which Buchanan later reused as a briefly seen cave-dwelling dinosaur in his 1969 film 'It's Alive!'.