- Writer:
- Jeremy Burnham
- Created by:
- Francis Durbridge
- Script Editor:
- Martin Hall
- Designer:
- Peter Kindred
- Producer:
- Derrick Sherwin
- Director:
- Christopher Barry
- Paul:
- Francis Matthews
- Steve:
- Ros Drinkwater
- Matthew Fox:
- Richard Burrell
- Two men:
- Eric Kent
- Two men:
- Steve Emerson
- Gwen Fox:
- Lana Morris
- Virginia Fox:
- Sarah Gibson
- Clive Fox:
- Freddie Foote
- The Master:
- Cyril Luckham
- Geoffrey Rudd:
- David Lyell
- Professor Gaunt:
- Aubrey Richards
- Harriet Parr:
- Alison Fiske
- Dr Macey:
- Bernard Kay
- Professor Appleby:
- Patrick Godfrey
- Professor Birkett:
- George Cormack
- Professor Decker:
- Oscar Quitak
- Lord Everton:
- Derek Francis
