20 May (releases)


 * 1967 - Episode one of The Evil of the Daleks was first broadcast on BBC1.
 * 1967 - Part three of TV Comic story The Exterminator was first published.
 * 1972 - Episode one of The Time Monster was first broadcast on BBC1.
 * 1972 - Part four of A Stitch in Time was first published in TV Action & Countdown.
 * 1978 - Part seven of TV Comic story Guardian of the Tomb was first published.
 * 1993 - Lucifer Rising was first published by Virgin Books.
 * 2006 - The Age of Steel was first broadcast on BBC One. Later, From Zero to Hero aired on BBC Three.
 * 2010 - Doctor Who Adventures comic story Track Attack was first published.