The Ape Woman

Scot Webster tries to save his sister Susan from the clutches of gangster W.S. Bruhl. When Scot comes to Bruhl's rented room, one of the gangster's henchmen collapses into his hands, killed by a gunman. The murderer tosses his gun to Scot and disappears. Since all the evidence points at him, Scot is arrested, tried and sentenced to death. A mad scientist uses his brain to transplant it into a gorilla. After the operation Scot wakes up in the body of a gorilla, eager to get his revenge...

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 from the circus and brought to his lab. Using the glands of a patient and the brain of his faithful nurse, he performs transplant surgery on the intelligent simian. When the ape morphs into exotic and sexy Paula Dupree, the experiment seems to be s success. She even finds a place for herself at her old circus assisting lion tamer Fred Mason. Unfortunately when aroused by desire and jealousy over the affections of Mason, her delicate metabolism breaks down, and she regresses to her ape form.

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 gorilla form every once in a while to kill somebody.

Once again, Paula Dupree, the Ape Woman, is brought back to life, this time by a mad scientist and his disfigured assistant, who also kidnaps his female lab assistant in order to have a female blood donor. By this time, Paula has brain damage from her experiences in the last film, so there's not much for her to do except wander around.