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Pages 142
ISBN 0-426-20335-6
Publication Date 15 June 1989


Accused of `crimes against the inviolate laws of evolution, The Doctor is on trial for his life.

The sinister prosecutor, The Valeyard, presents the High Council  of Time Lords with the second piece of evidence against The Doctor: a dramatic adventure on the planet Thoros Beta which led to the renegade Time Lord’ summons to the Court of Enquiry.

But as The Doctor watches the scenes on the Matrix he is puzzled by what he sees – his behaviour is not as he remembers. Only one thing is certain: on the evidence of the Matrix The Doctor is surely guilty as charged …



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    • Martin adds a tongue-in-cheek epilogue that reveals that Peri had not died as The Doctor had believed, but that she and Yrconos fell in love and travelled to Earth in he 20th century. Yrconos took up a career as a professional wrestler, with Peri as his manager. This ending spoils the later revelation of Peri’s survival in The Ultimate Foe. While the fact of Peri and Yrconos falling in love is consistent with the later story, the rest of it contradicts both televised and novelised versions of the The Ultimate Foe, as well as Per’s later appearances in books such as Bad Therapy.However, the revelation in Peri and the Piscon Paradox that the Time Lords created multiple timelines for Per leaves the dooropen for this variant fate to exist alongside the other fates described for Peri
    • The book opens with The Doctor musing on vague memories of the events on Thoros-Beta.
    • The novelisation adds an extra trial room character, Zon, who operates the matrix link.
    • The Valeyard makes several attempts to claim he has proved The Doctor’s life is forfeit only for The Doctor and the Inquisitor to insist the event be shown in full.
    • The Doctor is more obviously bloodthirsty after being exposed to the mindwarp machine, even encouraging Yrcanos to hurt Peri.
    • Dorf is killed taking a blast meant for Yrcanos rather than being shot in the back.
    • Kani is referred to simply as the Matrona throughout.
    • The rebel Verne is divided into two characters, Ger and Sorn.
    • The third Mentor is named Marne and is introduced earlieroverseeing the Induction Centre. He assures The Doctor he will not sound the alarm since it will hurt his ears, only for a guard to do so instead.
    • Instead of Frax handing The Doctor his phaser and the Doctor pointing it at him, The Doctor takes it from Frax’s holster and gives it to Yrcanos.
    • The trial sequence ends with The Valeyard promising to present evidence from The Doctor’s future. This does not match either televised or novelised version of Terror of the Vervoids in which the future segment is The Doctor’s defence. (This may be a relic of anearly version of the storyline, leading into the unproduced story Attack from the Mind.)

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