i) births and deaths

24 March 1935: birth of Rodney Bennett, director of three Fourth Doctor stories – The Ark in Space (1975), The Sontaran Experiment (also 1975) and The Masque of Mandragora (1976).

24 March 1942: birth of Lynda Baron, who performed "The Ballad of the Last Chance Saloon" in the story we now call The Gunfighters (First Doctor, 1966) and played Captain Wrack in Enlightenment (Fifth Doctor, 1983) and Val in Closing Time (Eleventh Doctor, 2011)

also 24 March 1942: birth of Stephen Yardley, who played Sevrin in Genesis of the Daleks (Fourth Doctor, 1975) and Arak in Vengeance on Varos (Sixth Doctor, 1985).

24 March 1972: birth of Shaun Dingwall, who played Rose Tyler's father Pete (and his parallel universe equivalent) in 2005 and 2006.

ii) broadcast anniversary

24 March 1973: broadcast of fifth episode of Frontier in Space. The Draconians realise that the Ogrons are behind it all, and join forces with Earth to pursue the Master to the Ogrons' planet.