A mysterious evil is at work on Gallifrey. The President of the Time Lords has been assassinated and the Doctor caught red-handed. An inexorable master plan has been set in motion. There can be no escape. In order to prove his innocence The Doctor must pursue his enemy into the Matrix, a dream-like repository of knowledge formed from the minds of dead Time Lords.
However, he quickly discovers that in the Matrix the real assassin rules and behind this enemy lurks the even more deadlier menace of his old adversary – The Master.
In Blood Harvest, The Doctor deals with a phoney Gallifreyan security council called the Committee of Three, composed of Time Lords whose careers were wrecked by The Doctor’s meddling, led by Goth’s younger brother Rath.
Exactly why The Doctor was expelled from the Academy is revealed in the Fifth Doctor’s flashback in Divided Loyalties.
Although The Master returns in his decaying form in The Keeper of Traken, one theory is that his exposure to the Eye of Harmony re-vitalized him and prevented his body from disintegrating completely. As such, The Master is visibly regenerating when he is seen just prior to his TARDIS dematerialising. This explains why The Master’s corpus on his next appearance was noticeably less putrescent than it appeared to be on Gallifrey.
