On 18 April, a number of things set in or relevant to the Doctor Who universe were released or published.
- 1964 - "The Velvet Web", the second episode of The Keys of Marinus, was first broadcast on BBC tv.
- 1970 - Episode five of The Ambassadors of Death was first broadcast on BBC1.
- 1970 - Part three of the TV Comic story Insect was first published.
- 1996 - Death and Diplomacy, The Eye of the Giant and Who Killed Kennedy were first published by Virgin Books.
- 1997 - The Dying Days was first published by Virgin Books.
- 2007 - The Doctor Who: Battles in Time comic story Plague Panic was first published.
- 2012 - DWDVDF 86 was first published by GE Fabbri Ltd.
- 2013 - The Doctor Who Adventure comic story Teacher's Pet was first published.
- 2017 - The Dollhouse was first released by Big Finish Productions.