21 September (releases)


 * 1968 - Episode two of The Mind Robber was first broadcast on BBC1.
 * 1968 - Part four of the TV Comic story Invasion of the Quarks was first published.
 * 1974 - Part five of the TV Comic story The Metal-Eaters was first published.
 * 1987 - Part three of Time and the Rani was first broadcast on BBC1.
 * 1989 - The novelisation of Mission to the Unknown was released by Target Books.
 * 1995 - Toy Soldiers and Managra were first published by Virgin Books.
 * 1996 - Part seven of the Radio Times comic story Descendance was first published.
 * 2000 - DWM 296 was first released by Panini Comics.
 * 2006 - The Nightmare of Black Island, The Art of Destruction and The Price of Paradise were first published by BBC Books.
 * 2009 - The Keys of Marinus was released on Region 2 DVD.
 * 2011 - DWDVDF 71 was first published by GE Fabbri Ltd.
 * 2017 - Doctor Who The Official Annual 2018 was first published by Penguin Group.
 * 2017 - DWM 517 was first released by Panini Comics.
 * 2020 - Cyberon was first published by Arcbeatle Press.