Cast 18

1. 

   William Hopper

   Colonel Robert Calder

2. 

   Joan Taylor

   Marisa Leonardo

3. 

   Frank Puglia

   Dr. Leonardo

4. 

   John Zaremba

   Dr. Judson

5. 

   Thomas Browne Henry

   Maj. Gen. A.D. McIntosh

6. 

   Tito Vuolo

   Commissario Unte

7. 

   Jan Arvan

   Signore Contino - Government Official

8. 

   Arthur Space

   Dr. Sharman

9. 

   Bart Braverman

   Pepe

10. Don Orlando

    Fisherman Mondello (uncredited)

11. George Khoury

    Fisherman Verrico (uncredited)

12. 

    Darlene Fields

    Reporter Reynolds (uncredited)

13. George Pelling

    Reporter Maples (uncredited)

14. 

    James Dime

    Felix Roi, a French reporter (uncredited)

15. Sid Cassel

    Farmer (uncredited)

16. 

    Ray Harryhausen

    Man Feeding Elephant (uncredited)

17. 

    Noel Drayton

    1st Reuters News Correspondent (uncredited)

18. Rollin Moriyama

    Dr. Koruku - Japanese Scientist

Crew 13