21 February (releases)


 * 1970 - Episode four of Doctor Who and the Silurians was first broadcast on BBC1.
 * 1970 - Part six of the TV Comic story The Arkwood Experiments was first published.
 * 1976 - Episode four of The Seeds of Doom was first broadcast on BBC1.
 * 1976 - Part four of the TV Comic story Virus was first published.
 * 1980 - The novelisation of The Invasion of Time was first published by Target Books.
 * 1980 - DWM 20 was released by Marvel Comics.
 * 1981 - Episode four of The Keeper of Traken was first broadcast on BBC1.
 * 1991 - DWM 171 was released by Marvel Comics.
 * 2007 - The Doctor Who: Battles in Time comic story Beneath the Skin was first published.
 * 2008 - Issue two of Torchwood Magazine was first published by Titan Magazines.
 * 2008 - DWA 52 was first released by BBC Magazines.
 * 2013 - DWA 308 was first released by Immediate Media Company London Limited.
 * 2018 - TCH 31 was first released by Hachette Partworks.