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On 21 February, a number of things set in or relevant to the Doctor Who universe were released or published.
- 1970
- Episode four of Doctor Who and the Silurians was first broadcast on BBC1.
- Part six of the TV Comic story The Arkwood Experiments was first published.
- 1976
- Episode four of The Seeds of Doom was first broadcast on BBC1.
- Part four of the TV Comic story Virus was first published.
- 1980
- The novelisation of The Invasion of Time was first published by Target Books.
- DWM 20 was released by Marvel Comics.
- 1981 - Episode four of The Keeper of Traken was first broadcast on BBC1.
- 1991 - DWM 171 was released by Marvel Comics.
- 2007 - The Doctor Who: Battles in Time comic story Beneath the Skin was first published.
- 2008
- Issue two of Torchwood Magazine was first published by Titan Magazines.
- DWA 52 was first released by BBC Magazines.
- 2013 - DWA 308 was first released by Immediate Media Company London Limited.
- 2018 - TCH 31 was first released by Hachette Partworks.
- 2019 - DWFC 144 was first released by Eaglemoss Collections.
- 2023 - All of Time and Space was first released by Big Finish Productions.