Fans loved this years Christmas special for "Doctor Who". In the episode the new thirteenth doctor was introduced, and some of the show's previous doctors also made appearance. Steven Moffat, the showrunner, states that the episode's main storyline were almost not written. To find out why, read comicbook.com's article, "Steven Moffat Says One Character Wasn't Originally Supposed to Be in the 'Doctor Who' Christmas Special."
