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On 21 May, a number of things set in or relevant to the Doctor Who universe were released or published.
- 1966 - "The O.K. Corral" was broadcast on BBC1.
- 1966 - Part one of the TV Comic story The Secret of Gemino was first published.
- 1977 - Part two of the TV Comic story Kling Dynasty was first published.
- 1981 - The Doctor Who Programme Guide was first published by Target Books.
- 1987 - The Doctor Who Fun Book and the novelisation of The Faceless Ones was first published by Target Books.
- 2001 - The audio story Loups-Garoux was first released by Big Finish Productions.
- 2002 - The audio story The Time of the Daleks was first released by Big Finish.
- 2005 - The Empty Child was first broadcast on BBC One. Later, Special Effects aired on BBC Three.
- 2009 - DWA 116 was first released by BBC Magazines.
- 2011 - The Rebel Flesh was first broadcast on BBC One. Later, Double Trouble aired on BBC Three.
- 2015 - Suburban Hell was first released by Big Finish.
- 2015 - The novelisation of City of Death was published by BBC Books and released as an audiobook by BBC Audio.
- 2015 - DWA15 2 was first released by Panini Comics.
- 2015 - DWFC 46 was first released by Eaglemoss Collections.
- 2020 - The Third Alien Worlds Collection was first released by BBC Audio.
- 2021 - The audiobook version of 666 Charing Cross Road was first released by Big Finish.
- 2024 - Bad Influence was first released by Big Finish.