The trailer for the Doctor Who Christmas special has been released, showing the regeneration of eleventh doctor Matt Smith.
The BBC has released the 30 second trailer for the Christmas special, entitled "The Time of The Doctor", due to air on Boxing Day on Prime TV in New Zealand Christmas Day.
The episode will be Matt Smith's last outing as the Time Lord before twelfth doctor Peter Capaldi takes his place.
The trailer opens ominously with narration from Jenna Coleman as Clara Oswald, before a mysterious woman says the "siege of Trenzalore is now begun", where Smith's Doctor is set to regenerate into a new body.
As a house explodes into flames, a Dalek can be heard saying: "The Doctor is regenerating."