as Prof. Frederick Brenner aka Karl Wagner
as Richard Dennison
as Judy Malvern
as Frankie Mills
as Charley
as Mrs. Brenner
as Fingers Dolan
as Capt. Mitchell
as Det. Pete Crawford
as Mrs. Malvern
as Doc Brooks
as "Trigger" Stratton
as The Big Tramp
as Det. Thompson (uncredited)
as Police Chief Martin (uncredited)
as Knocked-out Motorist (uncredited)
as Shopkeeper (uncredited)
as Jeweler (uncredited)
as Henchman (unconfirmed) (uncredited)
as Coroner (uncredited)
as Usher (uncredited)
as Cards-player Tramp (uncredited)
as Tramp questioned by Richard (uncredited)
as Tramp playing checkers at 'Friendly Mission' (uncredited)
as Tramp Playing Checkers at Friendly Mission (uncredited)
as Tramp (uncredited)
as Newsboy (uncredited)