TV
The unveiling of the 11th Doctor will come during an episode of behind-the-scenes show Doctor Who Confidential, airing on BBC One at 5.35pm.
"We believe the actor is going to bring something very special to the role and will make it absolutely their own. I just can't wait to tell everyone who it is, it has been a nail-biting Christmas trying to keep this under wraps!" said executive producer Piers Wenger.
Rumours have suggested that Paterson Joseph, David Morrissey and Robert Carlyle are in the frame to take over from Tennant, who announced his departure from the show in October.
The new Doctor will take over from Tennant at the end of four new specials, the last of which will air early in 2010, before appearing in a full fifth series.
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