Aktorių sudėtis 23

1. 

   Brian Donlevy

   Prof. Bernard Quatermass

2. 

   John Longden

   Chief Inspector Lomax

3. 

   William Franklyn

   Dr. Tom Brand

4. 

   Bryan Forbes

   Marsh

5. 

   Charles Lloyd Pack

   Work Camp Manager Dawson

6. Tom Chatto

   Vincent Broadhead, M.P.

7. 

   John Van Eyssen

   The Plant Tour Guide

8. 

   Sid James

   Jimmy Hall

9. 

   Percy Herbert

   Paddy Gorman

10. 

    Michael Ripper

    Ernie the Bartender

11. John Rae

    E. J. Macleod

12. Philipp Baird

    Lab Assistant

13. Betty Impey

    Kelly

14. Joyce Adams

    Woman Member of Parliament

15. 

    Edwin Richfield

    Peterson

16. 

    Vera Day

    Sheila

17. 

    Marianne Stone

    Miss Beal

18. Jane Aird

    Mrs. McLeod

19. 

    Michael Balfour

    Harry

20. 

    John Stuart

    The Police Commissioner

21. 

    John Fabian

    Intern

22. 

    George Merritt

    Super

23. Barry Lowe

    Chris (uncredited)

Filmavimo grupė 18