The Christmas Day 2008 special is called The Next Doctor.

The name of this episode has caused many fans to speculate that David Tennant's replacement will be his co-star David Morrissey.

As previously noted, live on the National Television Awards, David Tennant announced he will be leaving Who behind in 2010.

The first 2 minutes of this extra-special episode, which features the return of the Cybermen, will be premiered on Children In Need.