Cast 24

1. 

   James Whitmore

   Sgt. Ben Peterson

2. 

   James Arness

   FBI Agent Robert Graham

3. 

   Joan Weldon

   Dr. Pat Medford

4. 

   Edmund Gwenn

   Dr. Harold Medford

5. 

   Onslow Stevens

   Brig. Gen. Robert O'Brien

6. 

   Sean McClory

   Maj. Kibbee

7. 

   Sandy Descher

   The Ellinson Girl

8. 

   Chris Drake

   Trooper Ed Blackburn

9. 

   Don Shelton

   Trooper Capt. Fred Edwards

10. 

    Fess Parker

    Alan Crotty

11. Mary Alan Hokanson

    Mrs. Lodge

12. 

    Olin Howland

    Jensen

13. 

    William Schallert

    Ambulance Attendant

14. 

    Ann Doran

    Child Psychiatrist

15. 

    Dub Taylor

    Railroad Yard Watchman

16. 

    Leonard Nimoy

    Army Sergeant

17. 

    Richard Deacon

    Bald Reporter at L.A. News Conference

18. 

    Forbes Murray

    Government Official

19. 

    Kenner G. Kemp

    Trooper #2

20. Charles Perry

    Soldier

21. 

    Dorothy Green

    Matron

22. 

    Willis Bouchey

    Official at D.C. Meeting

23. Mary Lou Holloway

    Blonde at Police Station

24. 

    Dick York

    Teenager in Police Station

Crew 15