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.
 * 1988 - The novelisation of The Rescue was first released in paperback by Target Books.
 * 2007 - Issue sixty-two of Doctor Who: Battles in Time, including comic story Metal Mania, was first released by GE Fabbri Ltd.
 * 2010 - Audio documentary Doctor Who at the BBC: A Legend Reborn was first released by BBC Audio on CD.
 * 2010 - Doctor Who Adventures comic story The Unwelcome Visitors was first released by BBC Magazines.