The BBC has released the first image from a prequel to this year's Doctor Who Christmas special. A prelude to the sci-fi drama's traditional festive episode will air on November 16, as part of this year's Children in Need appeal. In addition to the mini-episode, a new trailer for the Christmas special - penned by Steven Moffat and expected to air on December 25 - will also be screened, giving viewers another glimpse at new companion Jenna-Louise Coleman. The episode will feature guest appearances from Richard E Grant and Silent Witness actor Tom Ward. Of the special, series star Matt Smith said: "It does the sort of wonderful Doctor Who-ey Christmas things - you know, snow, aliens, good will, good cheer, someone trying to take over the world. Hopefully it makes for good Christmas Day telly." The Christmas special will be followed by eight new Doctor Who episodes in 2013 - the show's 50th anniversary year.