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