The Doctor and his companion, Clara, are on the most beautiful train in history, speeding past the stars of the future. But something terrible is killing the passengers. After you see the mummy, you only have 66 seconds. Then you die. There is no escape. As the Doctor races against the clock, he seems to Clara more unfeeling than ever before. Will he learn how to stop the mummy? Start the clock!

The Doctor and his companion, Clara, are on the most beautiful train in history, speeding past the stars of the future. But something terrible is killing the passengers. After you see the mummy, you only have 66 seconds. Then you die. There is no escape. As the Doctor races against the clock, he seems to Clara more unfeeling than ever before. Will he learn how to stop the mummy? Start the clock!