Cast 28

1. 

   Jon Pertwee

   The Doctor

2. 

   Katy Manning

   Jo Grant

3. 

   Nicholas Courtney

   Brigadier Lethbridge-Stewart

4. 

   Richard Franklin

   Captain Mike Yates

5. 

   John Levene

   Sergeant Benton

6. 

   Roger Delgado

   The Master

7. 

   Pik-Sen Lim

   Captain Chin Lee

8. Raymond Westwell

   Prison Governor

9. 

   Michael Sheard

   Dr. Roland Summers

10. Simon Lack

    Professor Kettering

11. Fernanda Marlowe

    Corporal Bell

12. 

    Neil McCarthy

    George Patrick Barnham

13. Clive Scott

    Arthur Linwood

14. Roy Purcell

    Chief Prison Officer Powers

15. Eric Mason

    Senior Prison Officer Green

16. Bill Matthews

    Prison Officer

17. Barry Wade

    Prison Officer

18. Dave Carter

    Prison Officer

19. Martin Gordon

    Prison Officer

20. 

    William Marlowe

    Mailer

21. Hayden Jones

    Vosper

22. 

    Kristopher Kum

    Fu Peng

23. 

    Tommy Duggan

    Senator Alcott

24. David Calderisi

    Charlie

25. 

    Patrick Godfrey

    Major Cosworth

26. Johnny Barrs

    Fuller

27. Matthew Walters

    Main Gates Prisoner

28. Timothy Combe

    Prisoner (uncredited)

Crew 16