12 January (releases)

* 1974 - Part one of Invasion of the Dinosaurs was first broadcast on BBC1.
* 1974 - Part five of the TV Comic story The Amateur was first published.
* 1980 - Part four of The Horns of Nimon was first broadcast on BBC1, concluding Season 17 prematurely.
* 1982 - Part four of Castrovalva was first broadcast on BBC1.
* 1983 - Part four of Arc of Infinity was first broadcast on BBC1.
* 1984 - Part three of Warriors of the Deep was first broadcast on BBC1.
* 1984 - DWM 85 was first released by Marvel Comics.
* 1984 - The novelisation of Mawdryn Undead was first released by Target Books.
* 1985 - Part two of Attack of the Cybermen was first broadcast on BBC1.
* 1989 - DWM 145 was first released by Marvel Comics.
* 2010 - The complete Hornets' Nest was released for the first time together in one CD box set.
* 2011 - DWDVDF 53 was first published by GE Fabbri Ltd.
* 2012 - DWA 251 was first released by Immediate Media Company London Limited.
* 2012 - DWM 443 was first released by Panini Comics.
* 2016 - Wave of Destruction was first released by Big Finish Productions.
* 2017 - DWM 508 was first released by Panini Comics.
* 2017 - DWFC 89 was first released by Eaglemoss Collections.
* 2020 - Orphan 55 was first broadcast on BBC One.
* 2022 - Watchers was first released by Big Finish.
* 2023 - Friend of the Family was first released by Big Finish.