A old west town run by women. All the town's business is controlled by a woman gambler who tries not to succumb to the allure of a handsome and persistent cowboy.

Two men search the jungle for a woman who has been captured by a tribe of murderous gorillas. When they finally find her, they must fight off attacks by the gorillas, who are determined to keep her.

A mad scientist, Dr. Aranya (Jackie Coogan), has created giant spiders in his Mexican lab in Zarpa Mesa to create a race of superwomen by injecting spiders with human pituitary growth hormones. Women develop miraculous regenerative powers, but men mutate into disfigured dwarves. Spiders grow to human size and intelligence.

A civilization of gorgeous cavewomen abduct men for mating purposes. One of their victims is Engor, who seems to be smarter than the rest of the men. He discovers fire, battles a monstrous giant and attempts to win the hand of the prehistoric queen.