23 December (releases)

* 1967 - Episode one of The Enemy of the World was first broadcast on BBC1.
* 1967 - Part five of the TV Comic story Flower Power was first published.
* 1972 - Part four of the TV Action comic story Zeron Invasion was first published.
* 1978 - Part one of The Power of Kroll was first broadcast on BBC1.
* 1978 - Part two of the TV Comic story The Metal-Eaters was reprinted as a Fourth Doctor story.
* 1989 - The Incredible Hulk Presents comic story Nineveh! was first published.
* 1993 - DWM 208 was first released by Marvel Comics.
* 2002 - Blue Veils and Golden Sands was first broadcast on BBC Radio 4.
* 2007 - Blood of the Daleks Part 1, the first release of Big Finish's Eighth Doctor Adventures, was first released.
* 2009 - Part two of The Doctor on My Shoulder was first published online.
* 2010 - Quinnis was first released by Big Finish Productions.
* 2010 - Part six of Snowfall was first published online.
* 2014 - Toby Hadoke's Who's Round 99 was released online.
* 2015 - The Fright Before Christmas was first published by Candy Jar Books.
* 2015 - Black Dog was first released by Big Finish.
* 2015 - Part two of Haunted was first published online.
* 2015 - Welcome Home, Bernard Socks was published by Obverse Books.
* 2016 - The Hesitation Deviation was first released by Big Finish.
* 2016 - Toby Hadoke's Who Round 199 was released online.
* 2019 - The Short Trips audio story Peace in Our Time was released by Big Finish.
* 2021 - The animated versions of The Faceless Ones and Fury from the Deep as well as Episode 2 of The Evil of the Daleks and The Abominable Snowmen were released on BritBox.