John Leeson (born 16 March 1943) is an English actor. Although he has played on-screen roles, he is best known for two voice-only roles: Bungle in Rainbow and the Doctor's robot dog companion K9 in Doctor Who.
He voiced K9 in Seasons 15 and 16 of Doctor Who, starting with the characters introduction in "The Invisible Enemy", before leaving after two seasons, handing over the role to David Brierly for Season 17. When Brierley left after one season, Leeson agreed to return for Season 18 on the understanding that K9 would be written out during the season, which he was in "Warriors' Gate".
Subsequently, Leeson has made guest return appearances in "The Five Doctors", "School Reunion" and "Journey's End".
His roles in works with pages on TV Tropes:
TV- Crossroads: 6 episodes (1967-68) — Henri de Burgoyne
- Dad's Army: episode "Sons of the Sea" (1969) — Soldier
- On the House: episode "Let My People Go" (1970) — Young Man
- Rainbow: 50 episodes (1972) — Bungle
- Doctor Who:
- 56 episodes / 18 storiesshow list (1977-79, 1980-81, 1983, 2006, 2008) — K9 (voice)
- 4-episode story "The Power of Kroll" (1978-79) — Dugeen
- 3-episode story "Remembrance of the Daleks" (1989) — Dalek Battle Computer (voice)
- Blake's 7, episodes:
- "Mission to Destiny" (1978) — Pasco
- "Gambit" (1979) — Toise
- Jigsaw: episode "Spring" (1979)
- K-9 and Company: "A Girl's Best Friend " (1981) — K9 (voice)
- 'Allo 'Allo!: episode "Flight to Geneva" (1989) — Train's Cook
- The Bill: episode "Out of the Mouths" (1993) — Mr. Witchell
- Children in Need: "Dimensions in Time" (1993) — K9 (voice)
- Bugs: episode "Manna from Heaven" (1995) — Harris
- Doctors: episode "A Parent's Right to Choose" (2001) — Alan Carmichael
- Chuckle Vision: episode "Big Break" (2007) — Viscount
- K9: 26 episodesshow list (2009-10) — K9 (voice)
- The Sarah Jane Adventures: 12 episodes / 9 storiesshow list (2007-10) — K9 (voice)
Audio Play
- Big Finish Doctor Who:
- Main Range: "Zagreus" (2003) — K9
- Special Releases: "Shada" (2003) — K9
- Gallifrey: 18 releasesshow list (2004-13) — K9
- The Companion Chronicles: "The Time Vampire" (2010) — K9
- The Fourth Doctor Adventures: 32 releasesshow list (2013-21) — K9
- Novel Adaptations: 3 releasesshow list (2015) — K9
- The Diary of River Song: "A Forever Home" (2021) — K9
- The Lost Stories: "The Doomsday Contract" (2021) — K9
- The Eighth of March: "Emancipation" (2022) — K9
- Big Finish Blake's 7:
- The Liberator Chronicles Volume 11: "Escape from Destiny" (2015) — Pasco