i) births and deaths

9 December 1938: birth of Waris Hussein, director of An Unearthly Child (1963) and Marco Polo (1964).

9 December 1944: birth of Eric Saward, script editor 1982-86, author of three Fifth Doctor stories and one Sixth Doctor story; a somewhat controversial figure.

ii) broadcast anniversaries

9 December 1967: broadcast of fifth episode of The Ice Warriors. Clent prepares to use the ioniser; the Ice Warriors prepare to use their sonic cannon.

9 December 1978: broadcast of third episode of The Androids of Tara. The Doctor tries to rescue Romana, but it's her android double; the real Romana escapes and is recaptured.

9 December 2018: broadcast of The Battle of Ranskoor Av Kolos, last episode of Series 11. Team TARDIS discovers nine different distress calls, all coming from the same location on an unknown planet in the far future.