18 December (releases)

* 1965 - "Coronas of the Sun" was first broadcast on BBC1.
* 1971 - Part five of The Eternal Present was first published in Countdown.
* 1976 - Part one of the TV Comic story Dredger was first published.
* 1997 - DWM 260 was first released by Marvel Comics.
* 2000 - The Secret of Cassandra and The Mutant Phase were first released by Big Finish Productions.
* 2003 - Episode six of Scream of the Shalka was first released online.
* 2003 - Companion Piece was first published by Telos Publishing.
* 2006 - Time Flies aired on BBC Three.
* 2006 - Year of the Pig and Guilt was first released by Big Finish.
* 2006 - Short Trips: Dalek Empire was first released by Big Finish.
* 2008 - DWA 95 was first released by BBC Magazines.
* 2008 - The Vengeance of Morbius was broadcast on BBC Radio 7.
* 2010 - Regeneration was first broadcast on Disney XD.
* 2012 - Devil in the Smoke was first published by BBC Digital.
* 2013 - Prisoners of Time: Volume 3 was released by IDW Publishing.
* 2013 - The Mega was first released by Big Finish Productions, and Night of the Stormcrow became available for general release.
* 2014 - The audiobook versions of Engines of War and The Drosten's Curse were released by BBC Audio.
* 2014 - Toby Hadoke's Who's Round 96 was released online.
* 2014 - DWMSE 39 was first released by Panini Comics.
* 2014 - DWFC 35 was first released by Eaglemoss Collections.
* 2017 - The Night Before Christmas was released by Big Finish.
* 2017 - Message in the Cards was first published by Thebes Publishing.
* 2019 - The Torchwood audio story Expectant was first released by Big Finish.
* 2022 - The Big Finish Podcast 2251 was released on the Big Finish website.