21 December (releases)
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- You may be looking for the event in the DWU.
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On 21 December, a number of things set in or relevant to the Doctor Who universe were released or published.
- 1963 - "The Dead Planet", the first episode of The Daleks, premiered on BBC tv. Dalekmania began.
- 1964 - Part seven of the comic story The Klepton Parasites was published in the 680th issue of TV Comic.
- 1965 - The stage play The Curse of the Daleks premièred at Wyndham's Theatre. The short story The Daleks was published as a tie-in.
- 1968
- Episode eight of The Invasion premiered on BBC1.
- Part four of the TV Comic story Jungle of Doom was published.
- 1974 - Part three of the TV Comic story The Wanderers was published.
- 1988 - Part two of The Greatest Show In The Galaxy premiered on BBC1.
- 1989 - The novelisation of The Greatest Show in the Galaxy was published by Target Books.
- 1995 - DWM 234 was published by Marvel Comics.
- 1996 - Part ten of the Radio Times comic story Ascendance was published.
- 2011 - Part two of Attack of the Snowmen was published online.
- 2012 - Songtaran Carols was released online.
- 2014
- Part three of Behind You was published online.
- Toby Hadoke's Who's Round 98 was released online.
- 2015 - Part one of Haunted was published online.
- 2016 - The Ninth Doctor Ongoing #8, The Tenth Doctor Year Two #17, and The Eleventh Doctor Year Two #15 were published by Titan Comics.
- 2017
- Doctor Who and the Horror of Coal Hill was published as part of the 2017 Adventure Calendar.
- Toby Hadoke's Who's Round 231 was released online.
- 2018 - The Devil's Footprints was released by Big Finish Productions.
- 2020 - Incoming Transmission was released online.
- 2023 - Five Gold Rings was published by Candy Jar Books.
