21 May (production)


 * 1965 - "Journey into Terror" was recorded at Riverside Studios 1. (TCH 5)
 * 1969 - Jon Pertwee signed his contract for his début season as the Third Doctor.
 * 1987 - Location filming for Paradise Towers took place. (Doctor Who The Handbook: The Seventh Doctor)
 * 1990 - Location filming for Search Out Space took place. (Doctor Who The Handbook: The Seventh Doctor)
 * 2008 - The BBC formally announced Russell T Davies would step down as executive producer of Doctor Who in 2009, to be succeeded by Steven Moffat.
 * 2008 - Recording for The Doomwood Curse took place at The Moat Studios.
 * 2019 - Recording for The First Doctor: Volume Three took place.
 * 2019 - Recording for Heritage 2 took place at The Soundhouse.
 * 2020 - Big Finish announced the fifth and sixth series of their Doctor Who spin-off The War Master.