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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?

Director : William Nigh

Writer : Curt Siodmak, Richard Carroll

Cast

Boris Karloff

Maris Wrixon

Gene O'Donnell

Dorothy Vaughan

Henry Hall

Selmer Jackson