Cast
- Dennis Dugan
- Tom Trimble
- Jim Dale
- Sir Mordred
- Ron Moody
- Merlin
- Kenneth More
- King Arthur
- John Le Mesurier
- Sir Gawain
- Rodney Bewes
- Clarence
- Sheila White
- Alisande
- Robert Beatty
- Senator Milburn
- Cyril Shaps
- Dr. Zimmerman
- Kevin Brennan
- Winston
- Ewen Solon
- Watkins
- Pat Roach
- Oaf
- Reg Lye
- Prisoner
- Bruce Boa
- Air Force Officer
- Al Lampert
- NASA Technician
- Derek Suthern
- NASA VIP
Special Effects by
- Terry Adlam
- models assistant (uncredited)
- Ron Ballanger
- special effects (uncredited)
- Michael Collins
- special effects (uncredited)
- Mark Meddings
- special effects technician (uncredited)
- John Richardson
- special effects supervisor (uncredited)
Camera and Electrical Department
- Ray Sturgess
- camera operator
- Malcolm Vinson
- camera operator
- John Deaton
- focus puller (uncredited)
- Tony Jackson
- clapper loader (uncredited)
- Dickie Lee
- grip (uncredited)