The First Doctor arrives in Victorian London amid a Martian invasion. But he discovers all is not what it seems when Missy appears…

Soon, the Doctor is propelled into a future incarnation – the Tenth – but he is not alone in battling Missy and her Martian invaders. The Paternoster Gang – Madame Vastra, Jenny Flint and Strax – are also here to assist. But can they offer the Doctor any help in solving his own degeneration mystery?

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