18 March 1967: broadcast of second episode of The Macra Terror. Ben is brainwashed by the secret rulers of the camp; he and Polly encounter a Macra, but he denied it has happened.
18 March 1972: broadcast of fourth episode of The Sea Devils. The Doctor and the Master arrive separately at the Sea Devils’ lair and try to negotiate with them.
Sadly, that’s been true for some time. I remember a scholar of the European Union appearing on the BBC’s European election programme in 1999, but her explanations of what was going on and how the European parliament worked were at such variance with the subjects those appearing in their party political capacities wished to talk about that she had less screen time than she deserved.