13 September (releases)

* 1965 - Part three of the TV Comic story Lizardworld was first published.
* 1969 - Part two of the TV Comic story The Brotherhood was first published.
* 1975 - Part three of Terror of the Zygons was first broadcast on BBC1.
* 1975 - Part one of the TV Comic story The Sinister Sea was first published.
* 1980 - Part three of The Leisure Hive was first broadcast on BBC1.
* 1984 - DWM 93 was first released by Marvel Comics.
* 1986 - Part two of The Mysterious Planet was first broadcast on BBC1.
* 1989 - Part two of Battlefield was first broadcast on BBC1.
* 2007 - DWA 38 was first released by BBC Magazines.
* 2010 - The Cradle of the Snake, Project: Destiny, The Book of Kells, Find and Replace and Resurrecting the Past were all released by Big Finish Productions.
* 2011 - The Doomsday Quatrain and House of Blue Fire were released by Big Finish.
* 2012 - Exodus Code was first published by BBC Books.
* 2012 - DWA 286 was first released by Immediate Media Company London Limited.
* 2014 - Listen was first broadcast on BBC One.
* 2019 - Sheffield Steel: Essays on the Thirteenth Doctor was first published by Arcbeatle Press.