9 October 1912: birth of Seymour Green who played two villainous sidekicks, Hargreaves the butler in The Seeds of Doom (Fourth Doctor, 1976) and Mestor's chamerlain, Slarn, in The Twin Dilemma (Sixth Doctor, 1984).
9 October 1937: birth of Fiona Cumming, director of four Fifth Doctor stories and variously involved in other ways too.
9 October 2009: death of Barry Letts, producer of Who from Doctor Who and the Silurians (Third Doctor, 1970) to Robot (Fourth Doctor, 1974-75), director of Enemy of the World (Second Doctor, 1967-68) and The Android Invasion (Fourth Doctor, 1975), writer of The Dæmons (Third Doctor, 1972).
ii) broadcast and production anniversaries
9 October 1963: filming starts on the eventually broadcast version of the first ever episode, "An Unearthly Child".
9 October 1965: broadcast of Mission to the Unknown, the only episode of Who where no member of the regular cast appears; Marc Cory discovers the Daleks' plan and tries to send a message back to Earth before he is killed. Thsi still isn't from the episode (which is lost) but shows producer Verity Lambert, who was on her way out at this point, being menaced by the alien delegates who are the Daleks' allies.
9 October 1976: broadcast of episode 2 of The Hand of Fear. Sarah is rescued from the nuclear reactor, but the mysterious stone hand has other people it can control...