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?

Hrají: Boris Karloff, Maris Wrixon, Gene O'Donnell, Dorothy Vaughan, Henry Hall
Režie: William Nigh (1940)