Silver Nemesis

It's all over, Ace. I've lost, I can only surrender. The Cybermen will have the Nemesis.'

Launched into space 350 years ago, a meteor is returning to Earth. Inside it waits Nemesis, a silver statue made of the living metal validium, the most dangerous substance in the universe. Evil powers await the statue's return: the neo-Nazi de Flores and his stormtroopers: Lady Peinforte, who lost Nemesis in 1638; and the advance party of a Cyberman invasion force. But only one person has the power to activate Nemesis: the statue's creator, the Doctor.