The Adventures of K9

The Adventures of K9 was a series of four illustrated paperback storybooks for children written by David Martin and published by Sparrow Books in 1980. The four books feature K9, the character Martin co-created. The books were written in conjunction with a planned but unmade K9 animated series. Specifically, the stories feature what is most likely to be K9 Mark I and seemingly take place sometime after the events of TV: The Invasion of Time when the Doctor left K9 on Gallifrey.

The books include prefaces that indicate that K9 is working on behalf of the Time Lords.

A total of four books were published:


 * 1) K9 and the Time Trap
 * 2) K9 and the Beasts of Vega
 * 3) K9 and the Zeta Rescue
 * 4) K9 and the Missing Planet

They also suggest that the Doctor's real name might be the Theta Sigma nickname heard in The Invasion of Time and TV: The Happiness Patrol.