5 January (releases)


 * 1974 - Part four of The Time Warrior was first broadcast on BBC1.
 * 1974 - Part four of the TV Comic story The Amateur was first published.
 * 1980 - Part three of The Horns of Nimon was first broadcast on BBC1.
 * 1982 - Part two of Castrovalva was first broadcast on BBC1.
 * 1983 - Part two of Arc of Infinity was first broadcast on BBC1.
 * 1984 - Part one of Warriors of the Deep was first broadcast on BBC1, beginning Doctor Who's 21st season.
 * 1985 - Part one of Attack of the Cybermen was first broadcast on BBC1.
 * 1998 - Kursaal and The Face of the Enemy were first published by BBC Books.
 * 1998 - Timelash was released on VHS.
 * 2003 - Sometime Never... was first published by BBC Books.
 * 2009 - The Trial of a Time Lord was released on Region 4 DVD.
 * 2010 - The Keys of Marinus and The Twin Dilemma were released on Region 1 DVD.
 * 2012 - The Art of Death was first released by AudioGO.
 * 2012 - Part one of the Doctor Who Adventures comic story Vengeance of the Atomon was first published.
 * 2015 - Flywheel Revolution was first released by Big Finish Productions.
 * 2017 - The Pirate Planet was first published by BBC Books, and released as an audiobook by BBC Physical Audio.