6 June 1965: broadcast of "The Bride of Sacrifice", third episode of the story we now call The Aztecs. The Doctor gets engaged to Cameca.
6 June 1970: broadcast of fifth episode of Inferno. Now that the parallel Earth's crust has been penetrated, earthquakes are felt everywhere, and the Primords mass to attack.
6 June 2003: webcast of sixth episode of Shada. The Doctor and Romana defeat Skagra, and Romana pardons Professor Chronotis/Salyavin.