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On 9月20日, a number of things set in or relevant to the Doctor Who universe were released or published.
- 1965 - The fourth and final part of the TV Comic story Lizardworld was first published.
- 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.
- 1984 - The novelisation of The Aztecs was first released by Target Books.
- 1986 - An untitled continuity announcement was first broadcast.
- 1986 - Part three of The Mysterious Planet was first broadcast on BBC1.
- 1989 - Part three of Battlefield was first broadcast on BBC1.
- 1990 - The novelisation of Ghost Light was released by Target Books.
- 2001 - DWM 309 was first released by Panini Comics.
- 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.
- 2007 - DWM 387 was first released by Panini Comics.
- 2010 - The anthology Present Danger was first published by Big Finish Productions.
- 2012 - DWA 287 was first released by Immediate Media Company London Limited.
- 2012 - DWM 452 was first released by Panini Comics.
- 2014 - Time Heist was first broadcast on BBC One.
- 2017 - TCH 21 was first released by Hachette Partworks.
- 2018 - DWM 530 was first released by Panini Comics.
- 2018 - DWFC 133 was first released by Eaglemoss Collections.
- 2022 - Blood & Steel was first released by Big Finish.