20 September (releases)


 * 1969 - Part three of the TV Comic story The Brotherhood was first published.
 * 1975 - Part four of Terror of the Zygons was first broadcast on BBC1.
 * 1975 - Part two of the TV Comic story The Sinister Sea was first published.
 * 1980 - Part four of The Leisure Hive was first broadcast on BBC1.
 * 1984 - The Key to Time: A Year by Year Record was first published by W.H. Allen.
 * 1986 - Part three of The Mysterious Planet was first broadcast on BBC1.
 * 1989 - Part three of Battlefield was first broadcast on BBC1.
 * 2004 - Ghost Light was released on Region 2 DVD.
 * 2006 - Doctor Who: Battles in Time comic story Growing Terror was first published in its very first issue.
 * 2010 - The anthology Present Danger was first published by Big Finish Productions.
 * 2012 - The Doctor Who Adventures comic story Dawn of Time! was first published.
 * 2014 - Time Heist was first broadcast on BBC One.