|Author||Mike Tucker and Robert Perry|
|Series||Doctor Who book:|
Past Doctor Adventures
|Set in||Period between|
Illegal Alien and Storm Harvest
|5 October 1998|
|Preceded by||Last Man Running|
|Followed by||The Infinity Doctors|
It features the Seventh Doctor and Ace. It also includes appearances by the Wandering Jew and Jack the Ripper. Part of it is set in an alternate timeline, featuring parallel universe versions of Ian Chesterton and Barbara Wright. The villain is the Valeyard.
As well as the obvious references to Trial of a Time Lord and the First Doctor's era, the Valeyard's schemes bring the Doctor face-to-face with dark alternate versions of his other selves who have been corrupted by the Valeyard; these include a First Doctor who murdered other Time Lords to depart Gallifrey in the first place, a Fourth Doctor who destroyed the Daleks at their beginning (Genesis of the Daleks) and a Fifth Doctor who allowed Peri to die while taking the antitoxin for himself (The Caves of Androzani).
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