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On 4月12日, a number of things set in or relevant to the Doctor Who universe were released or published.
- 1965 - Part four of the TV Comic story On the Web Planet was first published.
- 1969 - Episode six of The Space Pirates was first broadcast on BBC1.
- 1969 - Part two of the TV Comic story Eskimo Joe was first published.
- 1974 - The Doctor Who Exhibition at Longleat House was opened.
- 1975 - Part six of Genesis of the Daleks was first broadcast on BBC1.
- 1975 - Part three of the TV Comic story Return of the Daleks was first published.
- 1984 - DWM 88 was first released by Marvel Comics.
- 1990 - DWM 160 was first released by Marvel Comics.
- 1999 - Revenge of the Cybermen was re-released on VHS, in its episodic edit.
- 2002 - Part three of No Child of Earth was first released online.
- 2007 - DWA 27 was first released by BBC Magazines.
- 2007 - DWMSE 16 was first released by Panini Comics.
- 2008 - The Fires of Pompeii was first broadcast on BBC One. Later, The Italian Job aired on BBC Three.
- 2012 - DWA 264 was first released by Immediate Media Company London Limited.
- 2012 - Energy of the Daleks was first released by Big Finish Productions.
- 2016 - And You Will Obey Me was first released by Big Finish Productions.
- 2016 - All physical copies of The HAVOC Files were mailed out by Candy Jar Books.
- 2017 - Part one of Beneath the Waves was first published in 12DY3 1.
- 2017 - Part two of The Tragical History Tour was first published in 11DY3 4.
- 2017 - Part three of Station Zero was first published in TW2 3.
- 2018 - The audiobook version of The Mark of the Rani was first released by BBC Audio.
- 2022 - The Outlaws was first released by Big Finish.