"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
Mike Donovan
as Policeman Barney (uncredited)
George Eldredge
as Policeman (uncredited)
Horace B. Carpenter
as Theater Watchman (uncredited)
Phil Rosen
Director
Robert Charles
Screenplay
Jack Dietz
Producer
Sam Katzman
Barney A. Sarecky
Associate Producer
Marcel Le Picard
Director of Photography
Carl Pierson
Editor
Arthur Hammond
Assistant Director
Dave Milton
Set Designer
Glen Glenn
Sound Engineer
Ray Mercer
Special Effects
Edward J. Kay
Music Director
