i) births and deaths

17 February 1916: birth of David Blake Kelly, who played the captain of the Mary Celeste in The Chase (First Doctor, 1965) and innkeeper Jacob Kewper in The Smugglers (First Doctor, 1966).

17 February 2013: death of Richard Briers, who played the Chief Caretaker in Paradise Towers (Seventh Doctor, 1988) and Henry Parker in A Day in the Death (Torchwood, 2008).

ii) broadcast anniversaries

17 February 1968: broadcast of third episode of The Web of Fear, introducing Nicholas Courtney as Colonel (later Brigadier) Alastair Lethbridge-Stewart. The Doctor reappears with a mysterious colonel; the Yeti attack the base to retrieve the model.

17 February 1973: broadcast of fourth episode of Carnival of Monsters. Kalik and Orum release the Drashigs, but Vorg is able to destroy them, and the Miniscope is deactivated.

17 February 1979: broadcast of fifth episode of The Armageddon Factor. The Doctor meets up with Drax; K9 is evil; Romana and Astra are still captives.

17 February 1996: broadcast of fifth episode of The Ghosts of N-Space on BBC Radio. The Doctor and Sarah return to 1818, where they unsuccessfully try to save Louise and Giuseppe.