6 November 1964: broadcast of "Horse of Destruction", fourth episode of the story we now call The Myth Makers; departure of Vicki and first appearance of Katarina. The Greeks emerge from the wooden horse, Troy is sacked and Steven is wounded as the Tardis departs.
6 November 1976: broadcast of second episode of The Deadly Assassin. The Doctor is put on trial, realises that the Master is behind the assassination, and enters the dream world of the Matrix.
6 November 2009: broadcast of second episode of The Eternity Trap (SJA). Sarah destroys Erasmus and his machine with the sonic lipstick and rescues Professor Rivers. (But what about Lord Marchmont?)
6 November 2010: broadcast of The Last Precinct (K9).