
John Leeson is a British actor who is known for voicing K-9 on the television series Doctor Who from 1977 to 1979, then from 1980 to 1981, and has returned for two single episode in the revived series. He also voiced K-9 in the show's spin-offs K-9 and Company, The Sarah Jane Adventures and K-9.

Doctor Who: The Five Doctors
1983 · as K9 (voice)

Whoops Apocalypse
1986 · as TV Interviewer

The Five(ish) Doctors Reboot
2013 · as Self

Parrot Fashion
2007

Tarka the Otter
1979 · as Secretary of the Hunt

Doctor Who: Full Circle
1980 · as K9 (voice)

Doctor Who: Shada
2003 · as K9 (voice)

Doctor Who: Dimensions in Time
1993 · as K9 (voice)

A New Beginning
2004

Doctor Who: Meglos
1980 · as K9 (voice)

A Matter of Time
2007

Doctor Who: The Armageddon Factor
1979 · as K-9 (voice)

Doctor Who: The Sun Makers
1977 · as K9 Mk. I (voice)

Longleat '83: The Greatest Show in the Galaxy
2001 · as Himself - Host

Doctor Who: The Leisure Hive
1980 · as K9 (voice)

Doctor Who: Underworld
1978 · as K-9 Mk. I (voice)

Husband to Mrs. Fitzherbert
1975 · as Clergyman

Doctor Who: The Power of Kroll
1979 · as Dugeen