an Entity references as follows:
"A Christmas Carol" is an episode of the British science fiction television programme Doctor Who. It is the sixth Doctor Who Christmas special since the programme's revival in 2005, and was broadcast on 25 December 2010 on both BBC One and BBC America, making it the first episode to premiere on the same day in both the United Kingdom and United States. It was written by Steven Moffat and directed by Toby Haynes.