Doctor Who fans have been given a look at the forthcoming Christmas special in the first proper trailer for the episode.
Called Matt Smith's departure as the Time Lord - with Peter Capaldi set to take his place.

Featuring Weeping Angels, Daleks, Cybermen and lots of explosions, the promo clip squeezes a lot into its meagre 36-second running time.
It begins with Jenna Coleman's Clara reciting: "And now it’s time for one last bow, like all your other selves, eleven's hour's over now, the clock is striking 12."
And Orla Brady's mysterious Tasha Lem then announces dramatically: "The siege of Trenzalore has now begun."
Later on amid the mayhem a Dalek is heard reporting: "The Doctor is regenerating!"
The episode is set to air on BBC One at 7.30pm on Christmas Day.