i) births and deaths

3 December 1928: birth of Gerald Blake, director of The Abominable Snowmen (Second Doctor, 1967) and The Invasion of Time (Fourth Doctor, 1978).

3 December 2019: death of Donald Tosh, script editor in 1965-66, author of "Bell of Doom", fourth episode of the story we now call The Massacre (First Doctor, 1966).

ii) broadcast anniversaries

3 December 1966: broadcast of fifth episode of The Power of the Daleks. Lesterson realises what the Daleks are up to; the rebels kill the governor; and the Daleks "CON-QUER AND DE-STROY"!

3 December 1977: broadcast of second episode of The Sunmakers. Leela and K9 attempt to rescue the Doctor; he escapes but they are captured.

3 December 2006: broadcast of They Keep Killing Suzie (Torchwood), the one where the woman who died in the first episode comes back and tries to steal Gwen's life.