Dr. Sigmund Walters, an expert in glandular research, becomes convinced that his experiments involving lower animal species cannot succeed, so he arranges to have a very intelligent female gorilla kidnapped…

Capt. Harper's cavalry patrol returns to the fort to find it besieged by Ute Indians. The apparent cause is the recapture of Army traitor Brett Halliday, who deserted to the…

Paula the ape woman (Acquanetta) is alive and well, and running around a creepy old sanitarium run by the kindly Dr. Fletcher (J. Carrol Naish), also reverting to her true…

Stage mentalist Gregor the Great becomes enraged when a drunken audience member belittles his act. When the man dies suddenly, Gregor convinces himself that his hypnotic powers are to blame….

A distraught Jeff Carter arrives at a renowned lawyer's home with a mysterious bag and a confession he desperately wants heard. Jeff was an underpaid chemist working for unprincipled pharmaceutical…