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

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)