20 December (releases)


 * 1975 - Part three of the TV Comic story The Dalek Revenge was first published.
 * 1979 - DWM 11 was first released by Marvel Comics.
 * 2010 - The Korven was first broadcast on Disney XD.
 * 2010 - Part five of Snowfall was first published online.
 * 2011 - Part one of Attack of the Snowmen was first published online.
 * 2011 - The beta version of the video game Worlds in Time was released by BBC Worldwide.
 * 2012 - DWMSE 33 was first released by Panini Comics.
 * 2014 - Part two of Behind You was first published online.
 * 2014 - Toby Hadoke's Who's Round 97 was released online.
 * 2021 - The Blu-ray box set The Collection: Season 17 was first released by BBC Studios.