K-9 was originally designed and
built by Professor Marius, a friend of the Fourth Doctor. When the Professor
couldn't take K-9 back to Earth because of weight restrictions, he became the
Doctor's faithful dog.
The Doctor knew his former travelling
companion, Sarah Jane Smith, would love a K-9 of her own, so he built K-9 mark
III and sent him to his old friend as a present!
Sarah Jane and K-9 made a great team,
battling enemies ranging from a witches' coven to the Krillitanes. After an
explosive encounter at Rose Tyler's old school, the Doctor had to build K-9
mark IV and this version stayed with Sarah Jane, helping her on many occasions
- including saving her life when Mr Smith went crazy evil!
Having averted disaster by sealing off an
artificially created black hole, K-9 left the attic to join Luke at Oxford University.
Of course, this left Sarah Jane with Clyde,
Rani and Mr. Smith. But all that changed with the arrival of a baby on her
In the know: K-9
Jane Smith (Previously the Doctor)
Creator: Professor Marius (A friend of the fourth Doctor)