Christopher Villiers

The Doctor and Clara are on the most beautiful train in history, unaware that a creature is stalking the passengers.

The Doctor returns to Gallifrey only to discover that a deadly game banned and derelict for centuries, has been reactivated. Soon he finds his other selves have also been summoned to assist him in tracing the culprit and tracking down the secret Rassilon.

The Master and the Doctor fight for control over Kamelion's mind while Turlough and Tegan make new allies in the castle in an attempt to avoid the iron maiden.