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E4 of 13
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Series 7 - Episode 4
The Power of Three
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Earth is invaded by millions of sinister-looking black cubes - but what is their purpose and who sent them? To find out the Doctor is forced to play a waiting game, so moves in with Amy and Rory, but soon drives them up the wall. Steven Berkoff, Mark Williams and Jemma Redgrave guest star.
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