Rondo Hatton

Hal Moffet AKA 'The Creeper'

Tom Neal

Clifford Scott

Jane Adams

Helen Paige

Donald MacBride

Police Captain M. J. Donelly

Peter Whitney

Police Lieutenant Gates

Tristram 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)