Also played by David Brierly (Season 17) First regular appearance: The Invisible Enemy
Final regular appearance: Warriors' Gate
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.
Other adventures featuring K-9: K-9 And Company | School Reunion
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