Tautology (short story)

 was a Brief Encounter short story published in the Doctor Who Magazine.

Summary
Professor Marius is offered an old dog-shaped computer by his niece, Gloria. When he goes to collect it, he finds that it has been in her fiancé's family for generations. After examining the internal circuitry he realizes that it could not have been built in the 20th century. The professor, though, is travelling to Titan and he is forced to have K9 destroyed and his own dog Toby placed into a dog home. He does, however, manage to save the motherboard, and on Titan finds someone willing to help him construct a new computer unit based on the designs of the original, thereby creating a temporal paradox.

Characters

 * Professor Marius
 * K9

Continuity
to be added