Arriving unexpectedly on "Gallifrey" without "Sarah Jane," the "Doctor"—played by Tom Baker—is immediately arrested and caught up in the President of the High Council’s murder. Facing a terrible outcome, he declares his intention to run for the position himself. Fortunately, "Castallan," portrayed by George Pravda, is suspicious of how easily things seem to be falling into place, so they begin working against the clo…