21 April (releases)
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On 21 April, a number of things set in or relevant to the Doctor Who universe were released or published.
- 1973 - Episode three of Planet of the Daleks premiered on BBC1.
- 1977 - Doctor Who and the Claws of Axos was published in paperback by Target Books.
- 1979 - Part four of the TV Comic story Size Control was reprinted as a Fourth Doctor story.
- 1988 - The novelisation of The Mysterious Planet was published by Target Books.
- 1994
- Legacy was published by Virgin Books.
- The novelisation of The Paradise of Death was published by Target Books.
- 1996 - The Surprise Surprise! special premiered on ITV.
- 2007 - Daleks in Manhattan premiered on BBC One, followed by A New York Story on BBC Three.
- 2010 - DWDVDF 34 was published by GE Fabbri Ltd.
- 2011
- DWMSE 28 was published by Panini Comics.
- DWA 214 was published by BBC Magazines.
- 2016
- The Curse of the Fugue was released by Big Finish Productions.
- DWFC 70 and DWFC RD 6 were published by Eaglemoss Collections.
- 2017 - Who's Who premiered on BBC One.
- 2021 - The Torchwood audio story Gooseberry was released by Big Finish.
- 2022
- The Torchwood audio story Infidel Places was released by Big Finish.
- DWMSE 60 was published by Panini Comics.
