the guilt that would have led to the Valeyard's creation and freeing the Sixth Doctor from the room as the Seventh accepts the Sixth Doctor as part of himself rather than focusing on his predecessor's flaws. In the BBC Books novel The Eight Doctors, by Terrance Dicks, the Eighth Doctor returns to the trial of the Sixth Doctor and rescues him from an alternative timeline in which the Sixth Doctor is about to be executed by the Valeyard before Mel and Glitz's arrival, the Eighth Doctor denouncing the charge of genocide as ludicrous due to the Vervoids having been artificially created rather than a naturally-evolving species. The Master reinforces the statement made in The Ultimate Foe to the Eighth Doctor—that the Valeyard is "an amalgam of the Doctor's darker side, somewhere between his twelfth and thirteenth regenerations." This combined with the information from The Twin Dilemma reinforces the idea that the Valeyard is indeed the Doctor's thirteenth and last "normal" incarnation. While the Sixth Doctor faces the Valeyard, the Eighth Doctor arranges for a restored Borusa to lead a committee of inquiry into the events that led to the Valeyard's creation and the Sixth Doctor's trial, but the crisis concludes with the Valeyard's apparent disappearance before the Eighth and Sixth Doctors resume their travels. In the Past Doctor Adventures novel Mission: Impractical by David A. McIntee, the villainous Mr Zimmerman, a renegade Time Lord who had hired two assassins to kill the Doctor, refers to the Sixth Doctor as "I" before correcting himself. McIntee has confirmed that this is a subtle hint that Zimmerman was actually the Valeyard. In Matrix by Robert Perry and Mike Tucker, the Valeyard again appears, and encounters the Seventh Doctor. After possessing the body of the Keeper, he acquires control over the Dark Matrix, the repository of all of the Time Lords' most evil impulses, and tries to use it to take revenge on the Doctor. To this end, he travels to London in 1888, taking on the identity of Jack the Ripper, and using the Ripper murders as sacrifices to power the Dark Matrix, believing that he can use and control the Matrix to grant himself a true existence independent of the Doctor. Once it has enough power, the Dark Matrix will be unleashed on the world, creating a dystopian nightmare and corrupting history forever. As an added bonus, the Valeyard has tracked down