Series: Special

Original Air date:  December 25, 2013

Number Doctor: 11th and 12th

Companion(s): Clara Oswald and Amy Pond

Writer(s):   Steven Moffat

Director(s):  Jamie Payne

Guest Stars:
Orla Brady as Tasha Lem
Elizabeth Rider as Linda
Sheila Reid as Gran
Mark Brighton as Colonel Albero
Rob Jarvis as Abramal
Tessa Peake-Jones as Marta
Jack Hollington as Barnable
Sonita Henry as Colonel Meme

Synopsis: 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.

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