Roxy and her boyfriend Tom venture into the desert in search of her father, who disappeared while investigating the possible existence of a living prehistoric man. They find Roxy’s father, but also a terrifying giant caveman named “Eegah”.
Scientist Frank (Frank Gerstle) uses atomic power in attempting a revolutionary brain transplant. An old woman, Mattie March (Marjorie Eaton) hires three foreign housekeepers with the idea of transplanting her brain into a sexy young woman's body.
A sheep rancher in the Nevada desert discovers that one of his flock has birthed a mutated embryo. A scientist takes charge of the mutant and tries to grow it to full size in his laboratory, only to have the giant monster sheep escape and wreak havoc.