21 December (releases)


 * 1963 - "The Dead Planet" was first broadcast on BBC tv. Dalekmania began.
 * 1965 - The stage play The Curse of the Daleks premièred at.
 * 1968 - Episode eight of The Invasion was first broadcast on BBC1.
 * 1968 - Part four of the TV Comic story Jungle of Doom was first published.
 * 1974 - Part three of the TV Comic story The Wanderers was first published.
 * 1996 - Part ten of the Radio Times comic story Ascendance was first published.
 * 2012 - Songtaran Carols was first released online.