Matrix (novel)

 was the sixteenth BBC Past Doctor Adventures novel. It featured the Seventh Doctor, Ace and the Valeyard. It also features alternate versions of Ian Chesterton and Barbara Wright.

Publisher's summary
"I won't fight you."

''"Oh, but you will." The voice twisted and cracked. Fury and madness tore through it. "You will fight me, Doctor!"''

The Doctor is on the run from a faceless enemy that knows his every thought and move. He flees to his past, planning to leave Ace in safe hands in order to fight on alone. But his enemy has other plans, and the Doctor's history no longer exists.

The TARDIS is finally drawn to London in the winter of 1888, where the Doctor and Ace discover a dark secret from Gallifrey's past, and the name of their unseen opponent. It is Jack the Ripper.

Plot
to be added

Characters

 * The Doctor
 * Ace
 * Ian Chesterton
 * Barbara Wright

The Doctor

 * The Doctor recalls watching a Gallifreyan dawn with his father.
 * The Valeyard's schemes bring the Seventh Doctor face-to-face with dark alternate versions of his other selves who have been corrupted by him, these include:
 * The First Doctor, who murdered other Time Lords to depart Gallifrey in the first place.
 * The Fourth Doctor, who destroyed the Daleks at their beginning.
 * The Fifth Doctor, who allowed Peri to die while taking the antitoxin for himself.

Technology

 * The Valeyard has mastery over the Dark Matrix.

Continuity

 * The Dark Matrix is remarkably similar of the Garvond which appeared in NA: The Dimension Riders.