The discovery of a perfectly preserved caveman prompts a mad scientist to attempt a daring brain transplant.
Bela Lugosi
as Prof. Dexter
John Carradine
as Prof. John Gilmore
Frank Moran
as Ape Man
Teala Loring
as Anne Gilmore
Tod Andrews
as Steve Rogers
Mary Currier
as Hilda Gilmore
Ernie Adams
as Tramp, Willie the Weasel
Eddy Chandler
as Sergeant
George Zucco
as Ape Man
Mike Donovan
as Policeman Barney (uncredited)
George Eldredge
as Policeman (uncredited)
Horace B. Carpenter
as Theater Watchman (uncredited)
