K9 and the Time Trap

K9 and the Time Trap was an illustrated childrens book by David Martin, co-creator of K9, published by Sparrow Books on 20th October 1980. It was the first of a series of four books, the others being K9 and the Beasts of Vega, K9 and the Zeta Rescue and K9 and the Missing Planet. All four books appear to star the original K9 at some point after he left the Doctor's side to remain on Gallifrey, though here he is depicted as a kind of intergalactic secret agent of the Time Lords, flying around in his spacecraft K-Nel.

The plot concerns K9's search for the missing Seventh Fleet, which has been abducted by a creature called Omegon (clearly intended to be the renegade Gallifreyan Omega).