20 April (releases)


 * 1968 - Episode six of Fury from the Deep was first broadcast on BBC1.
 * 1968 - Part four of TV Comic story The Cyber Empire was first published.
 * 1974 - Episode five of The Monster of Peladon was first broadcast on BBC1.
 * 1974 - Part seven of TV Comic story Is Anyone There? was first published.
 * 1978 - Doctor Who Discovers: Strange and Mysterious Creatures was first published by Target Books.
 * 1995 - Sanctuary was first published by Virgin Books.
 * 2013 - The second edition of The Nth Doctor was first published by iUniverse.
 * 2013 - Hide was first broadcast on BBC One.