Prof. Dexter
Bela Lugosi
Prof. John Gilmore
John Carradine
Policeman (uncredited)
George Eldredge
Theater Watchman (uncredited)
Horace B. Carpenter
Ape Man
Frank Moran
Anne Gilmore
Teala Loring
Steve Rogers
Tod Andrews
Hilda Gilmore
Mary Currier
Tramp, Willie the Weasel
Ernie Adams
Sergeant
Eddy Chandler
George Zucco
Policeman Barney (uncredited)
Mike Donovan
Director
Phil Rosen
Producer
Sam Katzman
Screenplay
Robert Charles
Jack Dietz
Sound Engineer
Glen Glenn
Set Designer
Dave Milton
Director of Photography
Marcel Le Picard
Music Director
Edward J. Kay
Associate Producer
Barney A. Sarecky
Special Effects
Ray Mercer
Assistant Director
Arthur Hammond
Editor
Carl Pierson