In 2070, the Earth's weather is controlled from a base on the moon. But when the Doctor and his friends arrive here, they discover all is not well. With Jamie injured, and members of the crew going missing, the Doctor realises that the moonbase is under attack. Some malevolent force is infecting the crew and sabotaging the systems as a prelude to an invasion of Earth. And the Doctor thinks he knows who is behind it - the Cybermen. Introduction by Gareth Roberts.
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