The mystery of the first question dominates Matt Smith's time on Doctor Who.
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The Doctor thought Gallifrey was destroyed in the Time War.
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And the Eleventh Doctor discovered cracks in time throughout the universe.
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Dorian told of an ancient question, "Doctor who?" that could cause silence to fall.
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The question was a passcode Gallifrey used to come through a crack on Trenzalore.
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The answer was the Doctor's real name, but answering would trigger a second Time War.
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Ultimately, the first question goes unanswered.
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