A new trailer for the final two Doctor Who specials of the year have just been shown at the Comic-Con convention in San Diego. The two special episodes see the regeneration of the 10th Doctor and will air later this year. The new trailer runs for over a minute and can be seen below, but please note that the quality is not great as it was filmed at the convention in San Diego with a camcorder.

The End of Time will air over Christmas this year and it stars David Tennant, Bernard Cribbins, John Simm, Alexandra Moen, Catherine Tate, Jacqueline King, and it includes guest appearances from Billie Piper, Camille Coduri, Elisabeth Sladen, John Barrowman, and many more. It is reported that the third special will be called "Nightmares Reign" and that the last of the specials is will be called "The End of Time". You can read an article about the trailer on the official website here.