The Doctor and the Master have been enemies for nearly all of their lives. Now in his ninth regeneration, and accompanied by Sylvie Lydon, his companion of several years, the Doctor has been ordered to seal the Master’s base of operations after the evil timelord’s apparant death.
Discovering that the Master is still alive, Sylvie pays the ultimate price. It’s a vengeful Doctor who persues the Master into an alternate universe, to a twisted version of the planet Earth, where it is impossible to tell who is friend and who is foe. The Doctor begins a quest to confront the Master once and for all, and finds that his belief system is now in serious jeopardy.