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On 9月21日, a number of things set in or relevant to the Doctor Who universe were released or published.
- 1968 - Episode two of The Mind Robber was first broadcast on BBC1.
- 1968 - Part four of the TV Comic story Invasion of the Quarks was first published.
- 1974 - Part five of the TV Comic story The Metal-Eaters was first published.
- 1987 - Part three of Time and the Rani was first broadcast on BBC1.
- 1989 - The novelisation of Mission to the Unknown was released by Target Books.
- 1995 - Toy Soldiers and Managra were first published by Virgin Books.
- 1996 - Part seven of the Radio Times comic story Descendance was first published.
- 2000 - DWM 296 was first released by Panini Comics.
- 2006 - The Nightmare of Black Island, The Art of Destruction and The Price of Paradise were first published by BBC Books.
- 2009 - The Keys of Marinus was released on Region 2 DVD.
- 2011 - DWDVDF 71 was first published by GE Fabbri Ltd.
- 2016 - TCH 52 was first released by Hachette Partworks.
- 2017 - Doctor Who The Official Annual 2018 was first published by Penguin Group.
- 2017 - DWM 517 was first released by Panini Comics.
- 2017 - DWFC 107 was first released by Eaglemoss Collections.
- 2020 - Cyberon was first published by Arcbeatle Press.
- 2022 - The Torchwood audio story A Postcard from Mr Colchester was released by Big Finish.