i) births and deaths

19 December 1915: birth of Simon Lack, who played Kettering in The Mind of Evil (1971) and Zadek in The Androids of Tara (1978)

19 December 1942: birth of Ian Talbot, who played Travis in Doctor Who and the Silurians (Third Doctor, 1970) and Klout in The Leisure Hive (Fourth Doctor, 1980).

19 December 1961: birth of Matthew Waterhouse, who played the Fourth and Fifth Doctor companion Adric from 1980 to 1982.

15 November 1933: birth of Donald Pickering, who played prosecutor Eyesen in the story we now call The Keys of Marinus (First Doctor, 1964), Blade and his alien double in The Faceless Ones (Second Doctor, 1967), and Lakertyan leader Beyus in Time and the Rani (Seventh Doctor, 1987).

19 December 2018: death of Bill Sellars, who directed the story we now call The Celestial Toymaker (First Doctor, 1966).

ii) broadcast anniversary

19 December 1964: broadcast of "The Waking Ally", fifth episode of the story we now call The Dalek Invasion of Earth. Jenny and Barbara are betrayed by the women in the woods and captured by the Daleks; Ian manages to break into the mine but hides in the missile which is headed for the earth's core; Susan and David kiss.