With now ten days until Christmas, the fifteenth door on the online Doctor Who Advent calendar, only available on the BBC's official Doctor Who website, was today made openable. Inside today's door is a video of David Tennant and executive producers Russell T Davies and Julie Gardner giving festive greetings. Along with the video, the official Doctor Who website was also updated with a brand new section for The End of Time part one, featuring many new desktop wallpapers, the trailer for the episode shown at the end of The Waters of Mars, and much more. Today's door on the Doctor Who Advent calendar can be visited by clicking here. The sixteenth door on the calendar will be made available to open tomorrow, and some details concerning that will be posted here after the door is activated.