Companions
K-9 played by John Leeson (voice)

Also played by David Brierly (Season 17)

K-9 played by John Leeson (voice)

Also played by David Brierly (Season 17)

K-9 joined the TARDIS when his original owner, Professor Marius, was unable to bring him back to Earth due to luggage limits. K-9 was a robotic dog which functioned as a mobile computer/defence system.

K-9 Mk I stayed with Leela on Gallifrey, the Doctor produced a K-9 Mk II, which remained in E-Space with Romana.

K-9 Mk III was a gift from the Doctor to Sarah Jane Smith.

K-9 Mk IV was also a gift from the Doctor to Sarah Jane Smith when K-9 Mk III was destroyed in an explosion.

Information about K-9

Home (Mark I)

  • Bi-Al Foundation

Home (Mark II)

  • The TARDIS

Home (Mark III)

  • London, Earth (20th century)

Home (Mark IV)

  • London, Earth (21st century)

K-9 has met the following Doctors

Appearances of K-9 / John Leeson (voice)

First Regular Appearance

Final Regular Appearance

K-9 reprises