On 20 December 1192, King Richard I of England was captured by King Leopold V of Austria after returning from the Crusades, prolonging the reign of King John of England and the Cyborg Sheriff of Nottingham. (PROSE: Time Traveller's Diary)
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According to a British War Office telegram, 20 December 1941 was the date that Reg Arwell was shot down over the English Channel. For a time, this remained Arwell's date of death. However, in a new version of history created by Madge Arwell and the Eleventh Doctor, it was the day when Madge saved her husband's life by guiding Reg's aeroplane across the Channel. (TV: The Doctor, the Widow and the Wardrobe)
In 1981, Brendan Richards was kidnapped by the Hecate Cult in Moreton Harwood. (TV: A Girl's Best Friend)
According to a calendar on the Snowcap base, 20 December 1986 was a Saturday. (TV: The Tenth Planet)
In 2036, Imogen Quaye's parents died in a skyway accident. An only child, Imogen was sent to live with her maternal aunt. (PROSE: Artificial Intelligence)