The discovery of a perfectly preserved caveman prompts a mad scientist to attempt a daring brain transplant.
Bela Lugosi
Prof. Dexter
John Carradine
Prof. John Gilmore
Frank Moran
Ape Man
Teala Loring
Anne Gilmore
Tod Andrews
Steve Rogers
Mary Currier
Hilda Gilmore
Ernie Adams
Tramp, Willie the Weasel
Eddy Chandler
Sergeant
