Many cast and crew have worked on other important science fiction films and television. The following are probably the major science fiction series, with a simple guide to who to look out for.
- Star William Shatner's first acting job was in a Canadian theatre group headed by Barry Morse (Victor Bergman)
- Martin Landau (John Koenig) was considered for the role of Spock, but declined in order to do Mission: Impossible (shot on an adjacent stage to Star Trek at Paramount Studios).
- Joan Collins (Kara, Mission Of The Darians) was a guest star in the episode "City On The Edge Of Forever" (1967).
- Karl Held (Jerry Travis, The Immunity Syndrome) was a guest star in the episode "The Return Of The Archons" (1967, credited as Christopher Held). Thanks to Dana Lubich.
- Writer Art Wallace (Siren Planet) wrote the episodes "Obsession" (1967) and "Assignment Earth" (1968)
- Fred Freiberger (Year 2 producer/ writer) produced the third and final series of Star Trek (1969).
- Kathryn Leigh Scott (Yesta, Dorzak) was a guest star in Who Watches The Watchers, 1989
- Carolyn Seymour (Eva, Seance Spectre) was a guest star in Contagion, 1989, First Contact, 1991, Face Of The Enemy, 1993, and, in Star Trek Voyager, Eye Of The Needle, 1995, Cathexis, 1995, Persistence of Vision, 1995
- Jeremy Kemp (Queller, Voyager's Return) was a guest star in Family, 1990.
- Nick Tate (Alan Carter) was a guest star in the episode Final Mission (1990), and in the Star Trek Deep Space Nine episode Honour Among Thieves (1998). He was considered for the role of Quark in Deep Space Nine (1993).
Some British stations broadcast Space: 1999 at the same time as Doctor Who, then at the height of its success with Tom Baker as the Doctor. Inevitably Space: 1999 ratings were dented by the strong established competition.
- Dallas Adams (Sam, Lambda Factor) was a guest star in "Planet Of Fire", 1984.
- John Alkin (Andy Johnson, Mark Of Archanon) was a guest star in "Planet Of Fire", 1984
- Geoffrey Bayldon (Number 8, One Moment Of Humanity) was a guest star in Creature from the Pit, 1979
- Isla Blair (Female Alien, War Games and Carla, Journey To Where) was a guest star in King's Demons, 1983
- Brian Blessed (Rowland, Death's Other Dominion and Mentor, The Metamorph) was a guest star in Mindwarp (1986)
- Roy Boyd (Lustig, Immunity Syndrome) was a guest star in The Hand Of Fear, 1976
- Peter Brayham (Garth, Devil's Planet and Alphan in other episodes) was stunt coordinator for the episodes The Christmas Invasion (2005), New Earth (2006), and School Reunion (2006)
- Bernard Cribbins (Brian's voice, Brian The Brain) was in the film, Daleks Invasion Earth 2150 AD (1966), and a recurring character (Wilfred Mott) in several stories in the 2007-2010 seasons.
- Peter Cushing (Raan, Missing Link) played the Doctor in the film, Daleks Invasion Earth 2150 AD, 1966
- Andy Dempsey (operative, Year One) was a guest in The Time Monster, 1972 and The Face Of Evil, 1977
- Gregory De Polnay (Pete Garforth, Lambda Factor) was a guest star in The Robots Of Death, 1977
- Max Faulkner (Ted Clifford, Ring Around The Moon) was a guest star in The Monster of Peladon, 1974, Planet Of The Spiders, 1974, Android Invasion, 1975, The Invasion of Time, 1978,
- Harry Fielder (George, Seance Spectre, also in Lambda Factor, Immunity Syndrome and The Dorcons) was an extra in The Wheel in Space (1968), Planet of the Spiders (1974), Revenge of the Cybermen (1975), The Seeds of Doom (1976), The Deadly Assassin (1976), The Face of Evil (1977), The Invisible Enemy (1977), The Ribos Operation (1978) , The Armageddon Factor (1979), Meglos (1980), Castrovalva (1982)
- Julian Glover (Jarak, Alpha Child) was a guest star in The Crusades (1969), and City Of Death (1979).
- John Hamill (Dominix, Force of Life) was a guest star in The Ribos Operation, 1978.
- Laurence Harrington (Jackson in Journey to Where, Stewart in The Dorcons) was in The Mind of Evil, 1971, and in Frontier in Space, 1973
- Alan Harris (Alphan, many Year 1 episodes) was a guest star in Face Of Evil, 1963
- Joy Harrison (Main Mission operative in Earthbound, Another Time, Another Place) was in Death to the Daleks, 1974
- Nick Hobbs (Clive Kander, Bringers Of Wonder) was a guest star in Mind Of Evil, 1971, The Curse of Peladon, 1972, The Time Monster (1972), and the Monster Of Peladon, 1974, The Ark in Space (1975)
- Gareth Hunt (pilot, Guardian Of Piri) was a guest star in Planet Of The Spiders, 1974
- Godfrey James (Alien Transport, Rules Of Luton) was a guest star in Underworld, 1978
- Paul Jerrico (Security guard, Dorzak) was a guest star in Arc Of Infinity, 1983
- Alf Joint (Steiner, Breakaway and Overseer, The Metamorph) was a stuntman on many episodes.
- Bernard Kay (mutant, New Adam new Eve) was a guest star in Dalek Invasion of Earth, 1964, The Crusades, 1965, The Faceless Ones, 1967, Colony In Space, 1971
- Gypsie Kemp (Earth nurse, Dragon's Domain) was a guest star in Day of the Daleks (1972).
- Annie Lambert (operative, various episodes) was a guest star in Four To Doomsday 1981
- John Laurimore (Smitty, Black Sun) was a guest star in Masque of Mandragora 1976
- Philip Madoc (Gorski, Breakaway) was a guest star in War Games, 1969, The Krotons, 1969, Brain of Morbius (1976), The Power Of Kroll, 1978, The Eleventh Hour, 2010.
- Roy Marsden (Crael, Devil's Planet) was a guest in Smith and Jones (2007).
- Tony Osoba (security guard, Space Warp) was a guest star in Destiny Of The Daleks, 1979 and Dragonfire, 1987, and Kill The Moon, 2014.
- Alibe Parsons (Alibe) was a guest star in "Mindwarp", 1986.
- Brendan Price (security guard, Catacombs Of The Moon) was a guest star in Face Of Evil, 1977
- Robert Russell (Hadin, Mission Of The Darians) was a guest star in Terror of the Zygons, 1975
- John Sarbutt (frozen guard, Force Of Life) was a guest star in Genesis of the Daleks (1975) and Four To Doomsday (1982)
- Catherine Schell (Maya) was a guest star in the episode City Of Death, 1979
- Robin Scott (Eric Sparkman, Breakaway) was a guest star in The Moonbase (1967), The Krotons (1969), and The War Games (1969).
- Michael Sheard (Dr Darwin King, Dragon's Domain) was a guest star in The Ark, 1966, Mind Of Evil, 1971, Pyramids Of Mars, 1975, the Invisible Enemy, 1977, Castrovalva, 1981, Remembrance Of The Daleks, 1988
- Roy Stewart (alien, The Metamorph) was a guest star in Tomb Of The Cyberman, 1967, and Terror Of The Autons, 1971
- Kevin Stoney (Talos, Last Enemy) was a guest star in The Dalek Master Plan, 1966, The Invasion 1968 and Revenge Of The Cybermen, 1975
- Patrick Troughton (Archon, The Dorcons) was the second actor to play the Doctor, 1966-1969, reprised in 1973 and 1984
- Zienia Merton (Sandra) was a guest star in the story Marco Polo, 1964, and in the spin-off series The Sarah Jane Adventures, story The Wedding of Sarah Jane Smith, 2009.
- Prentis Hancock (Paul Morrow) was a guest star in "Spearhead From Space", 1970, "Planet Of The Daleks", 1973, "Planet Of Evil", 1975, and "The Ribos Operation", 1978
- Terry Walsh (rescue Eagle pilot, Mark Of Archanon, and Scotsman, Journey To Where) was a stuntman in numerous episodes, 1968-1979
- Jeremy Young (Jack Bartlett, Bringers Of Wonder) was a guest star in An Unearthly Child, 1963 and Mission To The Unknown, 1965
- Nik Zaran (Jackson, Breakaway) was a guest star in The Space Pirates, 1969
- Johnny Byrne (writer) wrote the episodes The Keeper Of Traken, 1981, Arc Of Infinity, 1983, Warriors Of The Deep, 1984. In 1980 he was considered by the BBC to replace Douglas Adams as script editor for Tom Baker's final series in the show (the job went to Christopher Bidmead).
- Pip and Jane Baker (writers, A Matter Of Balance) wrote the episodes Mark Of The Rani, 1985, Trail Of A Time Lord part 3, 1986, Time & The Rani, 1987
- Terence Dicks (writer, The Lambda Factor) was script editor from 1968-1974 and wrote many episodes.
- Dennis Spooner (writer, Alien Attack scenes) was script editor from 1964-1965
- Martin Bower (model-maker) made models for the series including Pirate Planet (1978), Earthshock (1982), Vengeance on Varos (1985). He built a Tardis model used from 1982 onwards.
- Nick Allder (SFX lighting cameraman) filmed SFX sequences for The Space Pirates (1969), and The Invisible Enemy (1977). In the later episode, filmed at Bray Studios, he used the "barrel moon" model from Space: 1999 (see more).
- George Lucas originally approached Brian Johnson in 1976 to do the special effects for the first Star Wars film. Johnson was busy with Space: 1999 Year Two, but in 1979 he was in charge of effects for the sequel, The Empire Strikes Back.
- The standard of effects in Space: 1999 was a stated benchmark for the special effects in Star Wars. Lucas insisted the models and explosions should be better than seen on the television series.
- The early design for the Millenium Falcon was vetoed by George Lucas as it closely resembled the Space: 1999 Eagle (described in Robert Brown's detailed Star Wars ship commentaries). Early designs and concept models featured side legs, rear engines, side docking ports and a cone shaped nose that looked even more like the Eagle. A hammerhead was added to the model and it appeared on screen as the Blockade Runner, the first ship seen in the film. The Millennium Falcon was redesigned as a saucer shaped craft, the rush job creating serious inconsistencies between sets and model.
- David Tomblin (director) was assistant director on The Empire Strikes Back and Return Of The Jedi.
- Steve Lanning (second assistant director) was second assistant director on The Empire Strikes Back .
- Roy Button (third assistant director) was third assistant director on The Empire Strikes Back and Return of the Jedi.
- Jack Lowin (camera operator) was camera operator on Return of the Jedi.
- Michael Lockey (hairdresser, Seance Spectre, Devil's Planet, Dorcons) was hair dresser on Return Of The Jedi
- Jeffery Kissoon (Dr Vincent, year 2) appeared as Rear Admiral Guich in The Force Awakens (2015)
- Brian Blessed (Rowland, Death's Other Dominion and Mentor, The Metamorph) appeared as Boss Nass in The Phantom Menace (1999).
- Jenny Cresswell (Alphan, various episodes) appeared as Han Solo's girlfriend in a cut scene of Star Wars (1977)
- Michael Culver (Pete Irving, Guardian Of Piri) appeared as Captain Needa in The Empire Strikes Back (1980)
- Peter Cushing (Raan, Missing Link) starred as the Grand Moff Tarkin in the first film. He also appears (as CGI) in Rogue One A Star Wars Story (2016).
- Norwich Duff (Texas City Operative, Journey To Where) appeared as a rebel officer in The Empire Strikes Back (1980)
- Harry Fielder (George, Seance Spectre, also in Lambda Factor, Immunity Syndrome and The Dorcons) was a Death Star Trooper in Star Wars (1977)
- Anthony Forrest was Luke's friend "Fixer" in scenes that were cut, and a stormtrooper who is told these are not the droids he is looking for.
- Julian Glover (Jarak, Alpha Child) appeared as General Veers in The Empire Strikes Back (1980)
- Alan Harris (Alphan, many Year 1 episodes) was Leia's rebel escort and a Stormtrooper in Star Wars (1977), Bespin Guard and C3PO stand-in and body double for Harrison Ford in the carbonite in The Empire Strikes Back (1980), C3PO stand-in in Return Of The Jedi, and stand-in for Terence Stamp in The Phantom Menace (1999).
- Drewe Henley (Joe Ehrlich, Bringers Of Wonder) played a small role as Red Leader in the first film, and also appeared (in footage from the 1977 film) in Rogue One (2016).
- Christine Hewett (female Kaldorian, Earthbound) played one of the Tonnika Sisters in the Cantina sequence in the first film.
- Ken Hutchison (Sanderson, Seance Spectre) played a small role as an Imperial Officer in a conference room with Vader and Tarkin in Star Wars, but was cut from the final movie.
- Paul Jerrico (guard, Dorzak) played an AT-AT pilot in The Empire Strikes Back (1980).
- Alf Joint (Steiner, Breakaway and Overseer, The Metamorph) was a stuntman on Return of The Jedi (1983)
- Jack Klaff (security guard, Seed Of Destruction) played a minor role in the briefing room scene in the first film.
- Al Lampert (Ken Burdett, Bringers of Wonder) played the blockade runner captain in Star Wars (1977).
- Christopher Lee (Zantor, Earthbound) appeared as Count Dooku in Attack Of The Clones (2002) and Revenge Of The Sith (2005).
- Richard Le Parmentier (Sam Malcolm, Dorzak) played a small role as Admiral Motti in the first film.
- Angus MacInnes (Jelto, Devil's Planet) played a small role as Gold Leader in the first film, and also appeared (in footage from the 1977 film) in Rogue One (2016).
- Jack McKenzie (technician, The Last Sunset) played Cal Alder in The Empire Strikes Back
- Quentin Pierre (security guard Quinton or Pierce, both Years) was a stormtrooper in Star Wars (1977), a Bespin Guard in The Empire Strikes Back (1980) and stand-in for Billy Williams, and one of the Emperor's Royal Guards in Return of The Jedi
- Dave Prowse (Creature, Beta Cloud) starred as Darth Vader in the first three films (James Earl Jones supplied the voice)
- Shane Rimmer (Kelly, Space Brain) played a minor role as a technician in the first film.
- Pam Rose (Command Center Operative, many Year 2 episodes) played a minor role as an alien (named Leebub Sirln) in the Cantina sequence in the first film.
- Michael Sheard (Dr Darwin King, Dragon's Domain) appeared as Admiral Ozzel in The Empire Strikes Back (1980).
- Gerald Stadden (Male Mute, Mission Of The Darians) played an Ewok in Return of The Jedi (1983)
- Angela Staines (female Kaldorian, Earthbound) played one of the Tonnika Sisters in the Cantina sequence in the first film.
- Paul Weston (stuntman, various episodes) was a stunt coordinator on Return Of The Jedi.
- Nick Hobbs (Clive Kander, Bringers Of Wonder) was a technician in Rogue One A Star Wars Story (2016)
The first live action science fiction series by Gerry Anderson. Space: 1999 was originally conceived as a the second series of UFO
- Patrick Allen (Chairman, Alien Attack) played Turner in Timelash.
- Maxwell Craig (Guard, The Dorcons) was a Shado operative in most episodes.
- Stuart Damon (Parks in Matter of Life and Death, Guido in Bringers of Wonder) played Howard Byrne in Mindbender.
- Alan Harris (Alphan in many episodes) was SkyDiver operative in Destruction
- Anouska Hempel (Annette Fraser in Metamorph) played the Shado radio operator in The Man Who Came Back, Reflections In The Water, Mindbender, The Long Sleep.
- Drewe Henley (Ehrlich in Bringers of Wonder) played Captain Steve Maddox in Conflict.
- Godfrey James (Alien Transport in Rules of Luton) played Game Warden Mitchell in The Square Triangle.
- Susan Jameson (Prof. Juliet Mackie in Dragon's Domain) played Anne Stone in The Sound Of Silence.
- Philip Madoc (Commander Gorski in Breakaway) played Steven Rutland in A Question Of Priorities and Captain Steven in Destruction.
- Patrick Mower (Reilly in All That Glisters) played Cass Fowler in The Square Triangle
- Shane Rimmer (Kelly, Space Brain) played Bill Johnson in Identified and Computer Affair, and CIA agent in Confetti Check A-O.K..
- Barry Stokes (Jim Haines in Voyager's Return) played a Skydiver Engineer in Destruction and Reflections In The Water.
- Maureen Tann (Nurse/ Main Mission Operative in Force Of Life, Alpha Child, The Last Sunset) played a Moonbase operative in Reflections In The Water
- Douglas Wilmer (Commissioner Dixon in Dragon's Domain) played Dr Brunner in E.S.P.
Connections