21 April

History of Doctor Who

 * 1973 - Episode 3 of DW: Planet of the Daleks was first broadcast.
 * 1977 - Doctor Who and the Claws of Axos was released in paperback by Target Books.
 * 2007 - DW: Daleks in Manhattan was first broadcast.
 * 2008 - BFA: ''The Destroyer of Delights begins recording.