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 the short story 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.
* 2023 - The Revenge of Wormwood was first released by Big Finish.