
Acting
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: Gallifrey

The Doctor Who Escape Room: Team Third Doctor
as K9 (voice)

Darkness & Light: The Life of Graham Williams
as Self

The Doctors: The Tom Baker Years

Longleat '83: The Lost Footage

The Five(ish) Doctors Reboot
as Self

Doctor Who and the Shada Man
as K9 (voice)

Doctor Who: Gallifrey
as The Prince

Celebration: Doctor Who in 1983

The K-9 Files

Doctor Who: Behind the Sofa
as Self · 8 ep.

Myth Makers
as Himself · 1 ep.

Pointless Celebrities
as K-9 (voice) · 1 ep.

K-9
as K-9 (voice) · 26 ep.

The Sarah Jane Adventures
as K9 (voice) · 10 ep.

Doctor Who
as K9 (voice) · 2 ep.

Longitude
as BBC Producer · 1 ep.

Vanity Fair
as Priest · 1 ep.

Bugs
as Harris · 1 ep.

Shadow of the Noose
as Dickinson · 1 ep.