21 January (releases)


 * 1967 - Episode two of The Underwater Menace was first broadcast on BBC1.
 * 1967 - Part one of TV Comic story The Trodos Ambush was first published.
 * 1978 - Part three of Underworld was first broadcast on BBC1.
 * 1978 - Part two of TV Comic story The Snow Devils was first published.
 * 1988 - The novelisation of The Rescue was first released in paperback by Target Books.
 * 2009 - Doctor Who: Battles in Time comic story Metal Mania was first published.
 * 2010 - Doctor Who at the BBC: A Legend Reborn was first released by BBC Audio.
 * 2010 - Doctor Who Adventures comic story The Unwelcome Visitors was first published.