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.
 * 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 - Engines of War and Silhouette were released as talking books by BBC Audio.
 * 2014 - Toby Hadoke's Who's Round 96 was released online.
 * 2014 - DWMSE 39 was first released by Panini Comics.
 * 2017 - The Night Before Christmas was released by Big Finish Productions.
 * 2017 - Message in the Cards was first published by Thebes Publishing.
 * 2019 - The Torchwood audio story Expectant was first released by Big Finish.