21 April (releases)


 * 1977 - Doctor Who and the Claws of Axos was released in paperback by Target Books.
 * 1979 - Part four of TV Comic story Size Control was reprinted as a Fourth Doctor story.
 * 2007 - Daleks in Manhattan was first broadcast on BBC One. Later, A New York Story aired on BBC Three.
 * 2011 - Doctor Who Adventures comic story The Rage was first published.