The BBC Press Office have revealed the synopsis for this year's Christmas Special 'The Next Doctor.' It can be seen below as well as some promotional images which were also revealed.
It's Christmas Eve in 1851 and Cybermen stalk the snow of Victorian London, in this special Christmas edition of Russell T Davies's Bafta Award-winning time-travelling drama. When the Doctor arrives and starts to investigate a spate of mysterious deaths, he's surprised to meet another Doctor, and soon the two must combine forces to defeat the ruthless Miss Hartigan. But are two Doctors enough to stop the rise of the CyberKing?
David Tennant stars as The Doctor, David Morrissey as The Doctor and Dervla Kirwan as Miss Hartigan. This episode also features Velile Tshabalala as Rosita.
Credit to WhovianNet for the news.