- Royston Tickner
- Â Will Polberry / ... 27 episodes, 1974-1976
- Harold Goodwin
- Â Hawkins 27 episodes, 1974-1976
- Graham Simpson
- Â Tom 23 episodes, 1974-1976
- Donald Hewlett
- Â Wing Commander Julius Rogue / ... 21 episodes, 1975-1976
- Susan Dury
- Â Jane Steele / ... 15 episodes, 1974-1976
- David Rowlands
- Â Roger / ... 8 episodes, 1974-1976
- Brian Nissen
- Â Announcer 7 episodes, 1975-1976
- Clive Morton
- Â Wing Commander Rogue / ... 6 episodes, 1974
- Kristin Hatfield
- Â Katy 6 episodes, 1974
- Michael Knowles
- Â Nigel 6 episodes, 1975-1976
- Vladek Sheybal
- Â Boris Lubchenko 5 episodes, 1976
- Ed Bishop
- Â Cyrus T. Triphammer 5 episodes, 1976
- Madhav Sharma
- Â L.A. 4 episodes, 1976
- Shirley Allan
- Â Princess Zina 4 episodes, 1975
- David Scheuer
- Â Max 4 episodes, 1976
- Philip Madoc
- Â Spinetti 4 episodes, 1976
- Katya Wyeth
- Â Ilse 4 episodes, 1976
- Frank Coda
- Â Luigi 4 episodes, 1976
- Barry Linehan
- Â Admiral Kornpone 4 episodes, 1976
- Tony Alleff
- Â Suleyman 4 episodes, 1976
- Albert Moses
- Â Abdullah 4 episodes, 1976
- Chubby Oates
- Â Cyril 3 episodes, 1976
- Terry Nelson
- Â George 3 episodes, 1976
- Therese McMurray
- Â Penny 3 episodes, 1976
- Anthony Chinn
- Â Wu 3 episodes, 1975
- Vincent Wong
- Â Wong 3 episodes, 1975
- Reginald Marsh
- Â Scoop 3 episodes, 1976
- Nicholas Amer
- Â Uncle Achmed 2 episodes, 1976
- Donald Bisset
- Â Rumbold 2 episodes, 1976
- Jeanne Mockford
- Â Mother / ... 1 episode, 1976
- Prentis Hancock
- Â Hank 2 episodes, 1976
- Anthony Sharp
- Â Sir Jocelyn Foot-Crankshaw 2 episodes, 1974
- Adrian Lawson
- Â Captain Davis 2 episodes, 1974
- Tyros Kontrice
- Â Colonel M'Tusi 2 episodes, 1975
- Anthony Bailey
- Â Maynard 1 episode, 1974
- Michael Godfrey
- Â Hussein 1 episode, 1976
- Ruth Kettlewell
- Â Natasha Koslov 1 episode, 1974
- Leon Eagles
- Â Dwight D. Crosscable 1 episode, 1974
- Bartlett Mullins
- Â Wilkins 1 episode, 1974
- Gyearbuor Asante
- Â M'Butu 1 episode, 1975
- Richard Marner
- Â Admiral Kalmykov 1 episode, 1976
- Gyles Brandreth
- Â Probe 1 episode, 1975
- Peter Myers
- Â Pranger Phillips 1 episode, 1975
- Scott Forbes
- Â Squadron Leader Byrd 1 episode, 1976
- Edward Underdown
- Â Blunt (uncredited) 1 episode, 1976
