Today is the sixth of December and door six is now available to open on the BBC's official Doctor Who advent calendar. Four different printable Doctor Who Christmas cards are behind the door and all of them feature new promotional images for this year's Doctor Who Christmas special "The Next Doctor". You can view and download the cards here but please be aware that the first and fourth cards feature images that could be classed as spoilers. I have also uploaded these cards elsewhere online so that anyone living outside the United Kingdom can access them. You can view the cards in numerical order here, here, here and here. What do you think of these Christmas cards?