Prof. Frederick Brenner aka Karl Wagner
Bela Lugosi
Richard Dennison
John Archer
Doc Brooks
Lew Kelly
"Trigger" Stratton
Wheeler Oakman
The Big Tramp
Ray Miller
Det. Thompson (uncredited)
George Eldredge
Police Chief Martin (uncredited)
Eddie Kane
Knocked-out Motorist (uncredited)
Harry 'Snub' Pollard
Shopkeeper (uncredited)
Bernard Gorcey
Jeweler (uncredited)
Willy Castello
Henchman (unconfirmed) (uncredited)
Bob Reeves
Coroner (uncredited)
Walter McGrail
Judy Malvern
Wanda McKay
Usher (uncredited)
Jack Kenney
Cards-player Tramp (uncredited)
Ralph Littlefield
Tramp questioned by Richard (uncredited)
Pat Costello
Tramp playing checkers at 'Friendly Mission' (uncredited)
Eddie Hall
Tramp Playing Checkers at Friendly Mission (uncredited)
Theodore Lorch
Tramp (uncredited)
Victor Adamson
Newsboy (uncredited)
Bobby Stone
Frankie Mills
Tom Neal
Charley
Vince Barnett
Mrs. Brenner
Anna Hope
Fingers Dolan
John Berkes
Capt. Mitchell
J. Farrell MacDonald
Det. Pete Crawford
Dave O'Brien
Mrs. Malvern
Lucille Vance
Producer
Sam Katzman
Director
Wallace Fox
Original Story
Sam Robins
Screenplay
Gerald Schnitzer
Jack Dietz
Barney A. Sarecky
Art Direction
Dave Milton
Sound Engineer
Glen Glenn
Editor
Carl Pierson
Director of Photography
Mack Stengler
Original Music Composer
Edward J. Kay
Assistant Director
Arthur Hammond