Gerald Flood

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 mysterious secret of 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.

An unfaithful British civil servant asks McGill to retrieve a stolen diamond brooch from his mistress after he breaks off their affair. Guest-starring Edward Fox.