i) births and deaths

25 March 1920: birth of Patrick Troughton, who played the Second Doctor from 1966 to 1969 and returned on various occasions. He would have been 101 today.

ii) broadcast anniversaries

25 March 1967: broadcast of third episode of The Macra Terror, on the star's 47th birthday. Jamie and Polly are made to work in the pit, while the Doctor tries to analyse the mysterious gas. (This was also the date that the DVD/Blu-Ray of the story was released in 2019.)

25 March 1972: broadcast of fifth episode of The Sea Devils. The British government attempts to organise a nuclear strike on the Sea Devils.