Rondo Hatton

Character: Hal Moffet AKA 'The Creeper'

Tom Neal

Character: Clifford Scott

Jan Wiley

Character: Virginia Rogers Scott

Jane Adams

Character: Helen Paige

Donald MacBride

Character: Police Captain M. J. Donelly

Peter Whitney

Character: Police Lieutenant Gates

Fred Coby

Character: Young Hal Moffet

Janelle Johnson Dolenz

Character: Joan Bemis (as JaNelle Johnson)

Mary Ann Bricker

Character: Mary Ann Obringer (uncredited)

Tristram Coffin

Character: Police Lieutenant / voice of radio announcer (uncredited)

Joseph Crehan

Character: Police Commissioner Salisbury (uncredited)

John Hamilton

Character: Professor Cushman (uncredited)

Frank O'Connor

Character: Policeman at Helen's Apartment (uncredited)

Beatrice Roberts

Character: Nurse (uncredited)

Charles Wagenheim

Character: Pawnbroker (uncredited)

William Ruhl

Character: Policeman at Helen's Apartment (uncredited)

James Nolan

Character: Police Dispatcher (uncredited)

Oscar O'Shea

Character: Mr. Haskins - Grocer (uncredited)

Patrick McVey

Character: Detective at Helen's Apartment (uncredited)

Warren Jackson

Character: Jeweler (uncredited)