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)