Last regular appearance: Warriors' Gate
K-9 has also appeared in:
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.
Home (Mark I):
- Bi-Al Foundation
- The TARDIS
- London, Earth (20th century)
- London, Earth (21st century)