21 September (releases)
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On 21 September, a number of things set in or relevant to the Doctor Who universe were released or published.
- 1968
- Episode two of The Mind Robber premiered on BBC1.
- Part four of the TV Comic story Invasion of the Quarks was published.
- 1974 - Part five of the TV Comic story The Metal-Eaters was published.
- 1987 - Part three of Time and the Rani premiered on BBC1.
- 1989 - The novelisation of Mission to the Unknown was published by Target Books.
- 1995 - Toy Soldiers and Managra were published by Virgin Books.
- 1996 - Part seven of the Radio Times comic story Descendance was published.
- 2000 - DWM 296 was published by Panini Comics.
- 2006 - The Nightmare of Black Island, The Art of Destruction and The Price of Paradise were published by BBC Books.
- 2009 - The Keys of Marinus was released on Region 2 DVD.
- 2011 - DWDVDF 71 was published by GE Fabbri Ltd.
- 2016
- The Fourth Doctor #5 was published by Titan Comics.
- TCH 52 was published by Hachette Partworks.
- 2017
- Doctor Who The Official Annual 2018 was published by Penguin Group.
- DWM 517 was published by Panini Comics.
- DWFC 107 was published by Eaglemoss Collections.
- 2020 - Cyberon was published by Arcbeatle Press.
- 2022 - A Postcard from Mr Colchester was released by Big Finish.
- 2023 - Dying Hours was released by Big Finish.
