Rondo Hatton
Hal Moffet AKA 'The Creeper'

Tom Neal
Clifford Scott

Jan Wiley
Virginia Rogers Scott

Jane Adams
Helen Paige

Donald MacBride
Police Captain M. J. Donelly

Peter Whitney
Police Lieutenant Gates

Fred Coby
Young Hal Moffet

Janelle Johnson Dolenz
Joan Bemis (as JaNelle Johnson)

Mary Ann Bricker
Mary Ann Obringer (uncredited)

Tris Coffin
Police Lieutenant / voice of radio announcer (uncredited)

Joseph Crehan
Police Commissioner Salisbury (uncredited)

John Hamilton
Professor Cushman (uncredited)

Frank O'Connor
Policeman at Helen's Apartment (uncredited)

Beatrice Roberts
Nurse (uncredited)

Charles Wagenheim
Pawnbroker (uncredited)

William Ruhl
Policeman at Helen's Apartment (uncredited)

James Nolan
Police Dispatcher (uncredited)

Oscar O'Shea
Mr. Haskins - Grocer (uncredited)

Patrick McVey
Detective at Helen's Apartment (uncredited)

Warren Jackson
Jeweler (uncredited)