20 September (releases)
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On 20 September, 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 published.
- 1969 - Part three of the TV Comic story The Brotherhood was published.
- 1975
- Part four of Terror of the Zygons premiered on BBC1.
- Part two of the TV Comic story The Sinister Sea was published.
- 1980 - Part four of The Leisure Hive premiered on BBC1.
- 1984
- The Key to Time: A Year by Year Record was published by W.H. Allen.
- The novelisation of The Aztecs was published by Target Books.
- 1986
- An untitled continuity announcement premiered.
- Part three of The Mysterious Planet premiered on BBC1.
- 1989 - Part three of Battlefield premiered on BBC1.
- 1990 - The novelisation of Ghost Light was published by Target Books.
- 2001 - DWM 309 was published by Panini Comics.
- 2004 - Ghost Light was released on Region 2 DVD.
- 2006 - Doctor Who: Battles in Time comic story Growing Terror was published in its very first issue.
- 2007 - DWM 387 was published by Panini Comics.
- 2010 - Present Danger was published by Big Finish Productions.
- 2012
- DWA 287 was published by Immediate Media Company London Limited.
- DWM 452 was published by Panini Comics.
- 2014 - Time Heist premiered on BBC One.
- 2017
- Ruler of the Universe was released by Big Finish.
- True Stories was published by Big Finish.
- TCH 21 was published by Hachette Partworks.
- 2018
- DWM 530 was published by Panini Comics.
- DWFC 133 was published by Eaglemoss Collections.
- 2019 - The HAVOC Files: The Laughing Gnome was published by Candy Jar Books.
- 2022 - Blood & Steel was released by Big Finish.
