Diễn viên
Elisabeth Risdon
Mrs. Pringle
Margaret O'Brien
Alpha
James Craig
Mike Regan
Philip Merivale
Professor Peter Vincent
Howard Freeman
Professor Richards
Walter Fenner
Professor Endicott
Ava Gardner
Hat Check Girl (uncredited)
Pauline Starke
Bobby's Mother (uncredited)
Marsha Hunt
Katie Mallory
Kathleen Lockhart
Mrs. Catty
Robert Blake
Jerry
William Bishop
Reporter (uncredited)
Naomi Childers
Matron (uncredited)
Henry O'Neill
Professor Josh Pringle
Keenan Wynn
Packy Roost
Alan Napier
Dr. Woodring
Eddie Acuff
Policeman (uncredited)
Hooper Atchley
Pepi (uncredited)
Victor Sen Yung
Chinese Man (uncredited)
Donald Meek
Professor Catty
Sara Haden
Rhoda Kitterick
Barbara Bedford
Telephone Operator (uncredited)
Mike Mazurki
Fighter (uncredited)