21 October (releases)

* 1967 - Episode four of The Abominable Snowmen was first broadcast on BBC1.
* 1967 - Part three of the TV Comic story The Coming of the Cybermen was first published.
* 1972 - Part ten of the TV Action comic story The Ugrakks was first published.
* 1976 - The novelisation of Planet of the Daleks was released by Target Books.
* 1978 - Part four of The Pirate Planet was first broadcast on BBC1.
* 1982 - The novelisation of Logopolis was first released by Target Books.
* 1989 - Part two of the Incredible Hulk Presents comic story Hunger from the Ends of Time! was first published.
* 1993 - Blood Heat was first published by Virgin Books.
* 1993 - Timeframe: The Illustrated History was first published by Doctor Who Books.
* 1999 - DWM 284 was first published by Marvel Comics.
* 2002 - The Aztecs was first released on Region 2 DVD.
* 2009 - DWDVDF 21 was first published by GE Fabbri Ltd.
* 2010 - DWA 189 was first released by BBC Magazines.
* 2010 - DWM 427 was first released by Panini Comics.
* 2014 - Toby Hadoke's Who's Round 71 was released online.
* 2015 - The tenth series of Jago & Litefoot was first released by Big Finish.
* 2015 - Part two of the Doctor Who: The Tenth Doctor comic story The Singer Not the Song was first published by Titan Comics.
* 2015 - TCH 1 was first released by Hachette Partworks.
* 2016 - The Torchwood Archive was first released by Big Finish.
* 2016 - Toby Hadoke's Who's Round 190 was released online.
* 2018 - Rosa was first broadcast on BBC One.
* 2021 - Ashenden was first released by Big Finish.