Special

It is Christmas Eve, 1851, and Cybermen stalk the snow of Victorian London. When the Doctor arrives and starts to investigate a spate of mysterious deaths, he encounters a woman named Rosita and another man who calls himself "The Doctor". After failing to capture a Cybershade, the two men talk and the current Doctor thinks the other is a future regeneration of himself. However, "the Next Doctor" seems to be lacking many of the current Doctor's memories.

Meanwhile, the Cybermen are planning an attack on Earth, helped by their human ally, Miss Mercy Hartigan. The two Doctors must combine forces to defeat the ruthless Miss Hartigan.

But are two Doctors enough to stop the rise of the CyberKing?