The most voted for story in each semi-final will progress to the final, where the two most popular stories will battle it out for the Christmas Cup 2015 title. The two ties we have here are a battle between divisive regeneration episodes and two much-loved Matt Smith Specials.
You can choose your one favourite story from each semi-final in the polls below:
Voting closes on Saturday 12th December - so make sure to get your votes in before then! Next Sunday, the finalists will go head to head in the Christmas Cup final.