Rondo Hatton

Hal Moffet AKA 'The Creeper'

Tom Neal

Clifford Scott

Jan Wiley

Virginia Rogers Scott

Donald MacBride

Police Captain M. J. Donelly

Peter Whitney

Police Lieutenant Gates

Fred Coby

Young Hal Moffet

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)

Patrick McVey

Detective at Helen's Apartment (uncredited)