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On 4月13日, a number of things set in or relevant to the Doctor Who universe were released or published.
- 1968 - Episode five of Fury from the Deep was first broadcast on BBC1.
- 1968 - Part three of the TV Comic story The Cyber Empire was first published.
- 1974 - Episode four of The Monster of Peladon was first broadcast on BBC1.
- 1974 - Part six of the TV Comic story Is Anyone There? was first published.
- 1989 - DWM 148 was first released by Marvel Comics.
- 1995 - DWM 225 was first released by Marvel Comics.
- 2006 - The Stone Rose, The Feast of the Drowned and The Resurrection Casket were first published by BBC Books.
- 2006 - TDW 1 aired on BBC One.
- 2007 - TDW 15, including episode two of The Infinite Quest, first aired on CBBC.
- 2013 - Cold War was first broadcast on BBC One.
- 2015 - The Well-Mannered War and Damaged Goods were first released by Big Finish.
- 2016 - Legacy of Death was first released by Big Finish.
- 2017 - Spare Parts was released by Big Finish on vinyl.
- 2021 - The Dalek Protocol was first released by Big Finish.
- 2022 - Genesis was first released by Big Finish.