21 October (releases)


 * 1965 - The Avengers episode "Death at Bargain Prices" was aired in the UK for the first time. This episode of the series created by Sydney Newman included a cameo appearance by several Daleks — in toy form in a department store.
 * 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.
 * 1978 - Part four of The Pirate Planet was first broadcast on BBC1.
 * 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 released by Marvel Comics.
 * 2002 - The Aztecs was released on Region 2 DVD.
 * 2009 - DWDVDF 21 was first published by GE Fabbri Ltd.
 * 2010 - The Doctor Who Adventures comic story Cell Shock was first published.
 * 2010 - Hell House was first published in TM 24.
 * 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 Doctor Who: The Tenth Doctor comic story The Singer Not the Song was published.
 * 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.