As Clara plans to say goodbye to the Doctor the two visit a beautiful train in space, where passengers are being stalked by a mummy who can only be seen by those about to die.

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From BBC America:

The Doctor and Clara are on the most beautiful train in history speeding among the stars of the future. But a deadly creature is stalking the passengers. Once you see the horrifying Mummy you only have 66 seconds to live. No exceptions, no reprieve. As the Doctor races against the clock Clara sees him at his deadliest and most ruthless. Will he work out how to defeat the Mummy? Start the clock!

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