Cast 40

1. 

   Hugh Marlowe

   Dr. Russell A. Marvin

2. 

   Joan Taylor

   Carol Marvin

3. 

   Donald Curtis

   Maj. Huglin

4. 

   Morris Ankrum

   Brig. Gen. John Hanley

5. 

   Thomas Browne Henry

   Vice Adm. Enright

6. 

   Grandon Rhodes

   Gen. Edmunds

7. 

   John Zaremba

   Prof. Kanter

8. 

   Paul Frees

   Alien (voice)

9. 

   Frank Wilcox

   Alfred Cassidy

10. Sydney Mason

    Frank the garage man

11. 

    Larry J. Blake

    Motorcycle cop

12. 

    Bert Stevens

    Air Intelligence Command Officer

13. 

    Forbes Murray

    Military Officer at Experiment

14. 

    Arthur Tovey

    Officer/Civilian at Military Conference

15. Alan Wells

    Major Kimberly

16. 

    Nicky Blair

    Military Officer at Experiment (uncredited)

17. Jimmy Cross

    Military Messenger (uncredited)

18. Jack Deery

    Military Officer (uncredited)

19. 

    Charles Evans

    Dr. Alberts (uncredited)

20. Raoul Freeman

    Military Official (uncredited)

21. 

    Paul Frees

    Alien (voice) (uncredited)

22. James Gonzalez

    Military Official (uncredited)

23. Duke Green

    Minor Role (uncredited)

24. Ed Haskett

    Military Official (uncredited)

25. 

    Clark Howat

    Sgt. Nash (uncredited)

26. 

    Harry Lauter

    Cutting - Generator Technician (uncredited)

27. Don Marlowe

    Minor Role (uncredited)

28. William Meader

    Worker in Control Tower (uncredited)

29. 

    Sol Murgi

    Plane Passenger (uncredited)

30. 

    Forbes Murray

    Military Officer at Experiment (uncredited)

31. William J. O'Brien

    Radio Listener (archive footage) (uncredited)

32. Murray Pollack

    Plane Passenger (uncredited)

33. 

    Mike Ragan

    Tank Commander (uncredited)

34. Alan Reynolds

    Maj. Kimberly (uncredited)

35. 

    Dale Van Sickel

    Man Crushed Beneath Wall (uncredited)

36. Guy Way

    Civilian Observing Saucer Attack (uncredited)

37. Bob Whitney

    Plane Passenger (uncredited)

38. 

    Frank Wilcox

    Alfred Cassidy (uncredited)

39. Beal Wong

    Chinese Radio Listener (uncredited)

40. 

    William Woodson

    Narrator (voice) (uncredited)

Crew 17