The baddies and their mutant cousins the Cybershades—who are led by CyberKing—creep up on a vicar (Jason Morell) during a funeral in Victorian London.
Star David Tennant must team up with another Doctor, played by David Morrissey, to have any chance of defeating them.
But we can reveal Morrissey, 43—who is bookies’ favourite to become the next Who when Tennant leaves—will NOT be the new Doctor.
Instead, Gavin and Stacey star Mathew Horne, 30, is being lined up as a possibility, along with Mighty Boosh actor Noel Fielding, 35, and Trainspotting’s Robert Carlyle, 47.
Actors James Nesbitt and Rhys Ifans are outsiders for the role.
Last night a BBC source said: “A decision is imminent. But David Morrissey is definitely out. When you see the Christmas special it’s clear he is not in the running to come back permanently as the Doctor.”