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On 23 September, a number of things set in or relevant to the Doctor Who universe were released or published.
- 1967 - Episode four of The Tomb of the Cybermen was first broadcast on BBC1.
- 1967 - Part four of the TV Comic story Egyptian Escapade was first published.
- 1972 - Part six of the TV Action comic story The Ugrakks was first published.
- 1976 - The novelisation of Frontier in Space was first released by Target Books.
- 1978 - Part four of The Ribos Operation was first broadcast on BBC1.
- 1999 - DWM 283 was first released by Marvel Comics.
- 2009 - DWDVDF 19 was first published by GE Fabbri Ltd.
- 2009 - Through Time and Space was first released by IDW Publishing.
- 2010 - DWA 185 was first released by BBC Magazines.
- 2010 - DWM 426 was first released by Panini Comics.
- 2013 - The Beast of Babylon was first published by Puffin Books.
- 2015 - Toby Hadoke's Who's Round 139 was released by Big Finish.
- 2015 - TCH 17 was first released by Hachette Partworks.
- 2015 - 10DY2 1 and FD 5 were first released by Titan Comics.
- 2016 - Toby Hadoke's Who's Round 186 was released by Big Finish.
- 2025 - The Dalek Eternity 1 was first released by Big Finish.