On 21 March, a number of things set in or relevant to the Doctor Who universe were released or published.
- 1964 - "Rider from Shang-Tu", the fifth episode of Marco Polo, 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.
- 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 first broadcast.
- 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.
- 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 - The Doctor Who Adventures comic story The Tail of Decky Flamboon was first published.
- 2013 - DWMSE 34 was first published by Panini Comics.
- 2017 - Zaltys was first released by Big Finish Productions.