<P> "The Next Doctor" is the first of the 2008--2010 specials of the British science fiction television programme Doctor Who that was broadcast on 25 December 2008, as the fourth Doctor Who Christmas special of the revived series . During its original airing, the episode had an audience of 13.1 million viewers and was the second-most - watched programme of Christmas Day 2008 . </P> <P> In the episode, the Doctor visits Victorian era London during Christmas and meets a man claiming to be a future incarnation of the Doctor . The Cybermen (of the design of the parallel universe's Cybus Industries Cybermen) return in this episode, following their appearance in the two - part finale of series 2 in 2006, "Army of Ghosts" / "Doomsday". David Tennant stars as the Tenth Doctor with companions Jackson Lake (David Morrissey) and Rosita Farisi (Velile Tshabalala). </P> <P> The Doctor lands his TARDIS in London on Christmas Eve, 1851 . Overhearing cries for help, he encounters a man calling himself "The Doctor" and his companion Rosita, attempting to capture a Cybershade . The Cybershade escapes the trio . The Doctor, in talking to the man, comes to believe he may be a future incarnation of himself, who is suffering from amnesia . The man, dubbed the Next Doctor, takes the Doctor to a nearby house of a recently deceased reverend, believing him tied to a series of disappearances around London and the Cybershade . Inside, they discover a pair of Cybermen data - storage infostamps, which the Next Doctor recalls holding the night that he lost his memories . The two are attacked by Cybermen and the Doctor attempts to fight them off with a cutlass, but the Next Doctor kills them using electrical discharge from the infostamps . </P> <P> The two Doctors regroup with Rosita at the Next Doctor's base, where the Next Doctor claims his "TARDIS" is located . The Doctor is surprised to find that "TARDIS" is a gas balloon - "Tethered Aerial Release Developed In Style", and comes to realise that the Next Doctor is really a human, Jackson Lake, the supposed first missing person . The Doctor suspects that Jackson had encountered the Cybermen and used the infostamps, containing knowledge of the Doctor, to ward them off . Jackson's mind then entered a fugue state from the trauma of the Cybermen killing his wife, and as the infostamp had infused his mind with knowledge of the Doctor, he came to believe he was the Doctor . As Jackson contemplates this revelation, the Doctor and Rosita set off to try to find the source of the Cybermen, while the Doctor theorises that they have somehow managed to escape the Void using a Dimension Vault stolen from the Daleks (episode: "Doomsday"). </P>

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