The BBC Media Centre has released the official synopsis for the eighth episode of the current series of Doctor Who, read on for further details:
MUMMY ON THE ORIENT EXPRESS - by Jamie Mathieson
The Doctor and Clara are on the most beautiful train in history, speeding among the stars of the future - but they are unaware that 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!
Doctor Who: Mummy on the Orient Express will broadcast Saturday 11th October at 8:35pm on BBC One and BBC One HD.