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Title: The beginning of the end...
Review: The TARDIS, now with just the Doctor and Adric on board, has returned from E-Space. It is entered by a being of immense power, the Keeper of Traken, a peaceful place from which evil has been banished. But the Keeper knows his time is almost up, and sense an all-pervading evil which may threaten the Union of Traken in the difficult period between his death and the succession of the next Keeper. He asks the Doctor to come to Traken to ensure that the evil doesn't destroy the Union. But little does the Doctor know which of his old foes is the evil sensed by the Keeper...The penultimate story featuring Tom Baker as the Doctor, this story is great in its own right but also important in that it sets the stage for the next story, 'Logopolis'. It reintroduces a foe from the Doctor's past, and also a future ally: Nyssa, who becomes a companion.
