The Doctor and Ace have arrived behind the Iron Curtain, and the Soviet Union is seeking a new weapon that will give it mastery in the Cold War.What is the secret of the Martian relics? As the legendary War Lord Sezhyr returns to life, the Doctor is faced with some of his oldest and deadliest enemies.The fate of Earth – and the future of Ace – are now intertwined...

    The Eleventh is investigating a rift in space-time in the present day. And one other – the man they used to be but never speak of – is fighting the Daleks in the darkest days of the Time War. Driven by demons and despair, this battle-scarred Doctor is set to take a devastating decision that will threaten the survival of the entire universe… a decision that not even a Time Lord can take alone.On this day, the Doctor’s different incarnations will come together to save the Earth… to save the universe… and to save his soul.