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Caught in a "solar tsunami", the TARDIS is thrown to an island in the 22nd century where a monastery has been turned into a factory for pumping the deadly acid off the island. The crew of the factory, headed by Miranda Cleaves (Raquel Cassidy), creates doppelgängers (called "Gangers") of themselves using a self-replicated fluid known as the Flesh, which they can safely operate through dangerous duties and are disposable. The Doctor warns the c...

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