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On 3月21日, a number of things set in or relevant to the Doctor Who universe were released or published.
- 1964 - "Rider from Shang-Tu" was first broadcast on BBC tv.
- 1970 - Episode one of The Ambassadors of Death was first broadcast on BBC1.
- 1970 - Part four of the TV Comic story The Multi-Mobile was first published.
- 1981 - Part four of Logopolis was first broadcast on BBC1, completing the eighteenth season of Doctor Who.
- 1991 - DWM 172 was released by Marvel Comics.
- 1996 - SLEEPY and The English Way of Death were first published by Virgin Books.
- 1996 - Ace! The Inside Story of the End of an Era was first published by Doctor Who Books.
- 2005 - Blue Peter special 2005 was broadcast on BBC One and CBBC.
- 2007 - The Doctor Who: Battles in Time comic story Beyond the Sea was first published.
- 2008 - Fragments was first broadcast on BBC Three, followed by Quid Pro Quo.
- 2009 - Hothouse: Part 1 was first released in Big Finish's Eighth Doctor Adventures Series 3.
- 2011 - The CD Doctor Who - A Christmas Carol was first released by Silva Screen.
- 2012 - DWDVDF 84 was first published by GE Fabbri Ltd.
- 2013 - DWA 312 was first released by Immediate Media Company London Limited.
- 2013 - DWMSE 34 was first published by Panini Comics.
- 2014 - Toby Hadoke's Who's Round 50 was released online.
- 2017 - Zaltys was first released by Big Finish.
- 2018 - The Third Doctor Adventures: Volume Four was first released by Big Finish.
- 2018 - TCH 12 was first released by Hachette Partworks.
- 2019 - DWFC 146 was first released by Eaglemoss Collections.
- 2020 - Strax Saves the Day was released online, launching the Doctor Who: Lockdown! series.