14th September 2006: death of Peter Ling, who wrote The Mind Robber (though not the first episode; see below).
14th September 1968: broadcast of first episode of The Mind Robber, one of the best single episodes of all time, written at short notice by script editor Derrick Sherwin when it became apparent that Peter Ling’s script would not fill the time made available by cutting The Dominators. The Dorctor escapes the lava flow by taking the Tardis outside space and time, to a mysterious white void, where it explodes, leaving Zoe memorably clinging to the console.
14th September 1987: broadcast of episode 2 of Time and the Rani. The Doctor escapes the Tetraps, but is caught again, and the Rani prepares to drain his brain.
non-canonical yet somehow true
The best description of Curse of Fatal Death I’ve come across so far.