Spoilers are precisely defined here. Rules vary by the story's medium. Info from television stories can't be added here until after the top or bottom of the hour, British time, closest to the end credits roll on BBC One. Therefore, fans in the Americas who are sensitive to spoilers should avoid Tardis on Sundays until they've seen the episode.



The Adventures of K9 was a series of four illustrated paperback storybooks for children written by David Martin and published by Sparrow Books together on 20 October 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.[1] Specifically, the stories feature what is most likely to be K9 Mark I and seemingly take place sometime after the events of 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. They also suggest that the Doctor's real name might be the Theta Sigma nickname heard in The Armageddon Factor and The Happiness Patrol.

In 2013, an audio anthology was released collecting all four stories.


Title Author Featuring Released on
K9 and the Time Trap Dave Martin Omegon 20 October 1980
K9 and the Beasts of Vega
K9 and the Zeta Rescue Time Lords
K9 and the Missing Planet

Cover gallery[]


  1. Preddle, Jon (October 1994). Affirmative, Master: All you ever wanted to know about K9. Time-Space Visualiser. New Zealand Doctor Who Fan Club. Retrieved on 19 June 2012.