The picture features Matt Smith as the Doctor running through a "fiery" passageway holding the Sonic Screwdriver.
The 2011 Christmas episode is written by Steven Moffat and sees the Doctor land in World War II. It boasts a stellar line-up of guest stars including Claire Skinner, Alexander Armstrong and Bill Bailey.
The annual Children in Need telethon (tomorrow, 7.30pm, BBC One) will reveal the title of the special, along with a world exclusive preview of the episode.
The image can be downloaded as a desktop wallpaper from the official Doctor Who website.