The first clip has arrived from the Doctor Who Christmas Special 2013, "The Time of the Doctor", which marks Matt Smith's final performance as the Time Lord. Take a special sneak peek before it arrives on BBC America December 25 at 9:00 pm Et/Pt. Orbiting a quiet backwater planet, the massed forces of the universe's deadliest species gather, drawn to a mysterious message that echoes out to the stars - and amongst them, the Doctor. Rescuing Clara from a family Christmas dinner, the Time Lord and his best friend must learn what this enigmatic signal means for his own fate and that of the universe.