Dr. Bernard Adrian is a kindly scientist who seeks to cure a young woman's polio. He needs human spinal fluid to complete the formula for his experimental serum. Meanwhile, a vicious circus ape has broken out of its cage, and is terrorizing the townspeople. Can there be a connection?

Cast:Boris Karloff, Maris Wrixon, Gene O'Donnell, Dorothy Vaughan, Henry Hall, Selmer Jackson,

Genre:Horror, Mystery, Science Fiction,

country:United States of America,

Production:Monogram Pictures,