An 'ancient' pyramid appears overnight. Every clock in the world begins counting down to the Earth's destruction. Three opposing armies lie ready to annihilate each other. An alien race stands ready to offer humanity a deal that could save them, but enslave them. It is a terrifying race against time to save the world. Will the Doctor be forced to accept their help?

Rob discusses the episode with special guest, Paul Scoones (Doctor Who non-fiction author, The Comic Strip Companion), while Dave is overseas.

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