From BBC Video. 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 among 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. The final adventure of the eleventh Doctor, the 2013 Doctor Who Christmas special stars Matt Smith and Jenna Coleman.
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