20 October (production)

* 1964 - The Hidden Planet was officially rejected by script editor David Whitaker.
* 1969 - Location filming for Spearhead from Space took place. (REF: Doctor Who The Handbook: The Third Doctor)
* 1975 - Studio filming for The Brain of Morbius took place at BBC Television Centre studio 3. (REF: Doctor Who The Handbook: The Fourth Doctor)
* 1977 - Full scripts for The Pirate Planet were commissioned from Douglas Adams.
* 1978 - Filming for The Power of Kroll took place at Bray Studios. (REF: Doctor Who The Handbook: The Fourth Doctor)
* 1981 - Studio filming for Black Orchid took place. (REF: Doctor Who The Handbook: The Fifth Doctor)
* 2009 - The Big Finish audio story Legend of the Cybermen was recorded at the Moat Studios.
* 2011 - The first series of Big Finish's audio series Counter-Measures was recorded at the Moat Studios. The series was announced on the Big Finish website.
* 2017 - The Big Finish audio story I Am The Master was recorded at the Moat Studios.
* 2018 - Big Finish's The War Master audio anthology Rage of the Time Lords was recorded.
* 2020 - The Big Finish audio story The End of the Beginning was recorded remotely.
* 2022 - Big Finish announced the casting of Shane Richie and Nina Wadia for the audio anthology Connections.