Prof. Frederick Brenner aka Karl Wagner

Richard Dennison

Judy Malvern

Frankie Mills

Charley

Mrs. Brenner

Fingers Dolan

Capt. Mitchell

Det. Pete Crawford

Mrs. Malvern

Doc Brooks

"Trigger" Stratton

The Big Tramp

Det. Thompson (uncredited)

Police Chief Martin (uncredited)

Knocked-out Motorist (uncredited)

Shopkeeper (uncredited)

Jeweler (uncredited)

Henchman (unconfirmed) (uncredited)

Coroner (uncredited)

Usher (uncredited)