Cast: Frazer Hines (Jamie McCrimmon), Dominic Mafham (Moran)
A cell. Four walls, one door. Jamie McCrimmon can escape, but it means unravelling a puzzle of extraordinary complexity.
And there are more than just two players in this game. The Doctor is there. So is his opponent Side.
As a hero turns killer, and a rebellion becomes anarchy, the lines between good and evil are blurred. And so does the distinction between cause and effect...