Cast 23

1. 

   Margaret O'Brien

   Alpha

2. 

   James Craig

   Mike Regan

3. 

   Marsha Hunt

   Katie Mallory

4. 

   Philip Merivale

   Professor Peter Vincent

5. 

   Henry O'Neill

   Professor Josh Pringle

6. 

   Donald Meek

   Professor Catty

7. 

   Keenan Wynn

   Packy Roost

8. 

   Alan Napier

   Dr. Woodring

9. 

   Sara Haden

   Rhoda Kitterick

10. 

    Kathleen Lockhart

    Mrs. Catty

11. 

    Howard Freeman

    Professor Richards

12. 

    Walter Fenner

    Professor Endicott

13. 

    Elisabeth Risdon

    Mrs. Pringle

14. 

    Robert Blake

    Jerry

15. 

    Barbara Bedford

    Telephone Operator (uncredited)

16. 

    Ava Gardner

    Hat Check Girl (uncredited)

17. 

    Mike Mazurki

    Fighter (uncredited)

18. 

    Pauline Starke

    Bobby's Mother (uncredited)

19. 

    Eddie Acuff

    Policeman (uncredited)

20. 

    Hooper Atchley

    Pepi (uncredited)

21. 

    William Bishop

    Reporter (uncredited)

22. 

    Naomi Childers

    Matron (uncredited)

23. 

    Victor Sen Yung

    Chinese Man (uncredited)

Crew 11