27 May 1926: birth of Peter Ling, who wrote The Mind Robber (Second Doctor, 1968)
27 May 1981: death of Kit Pedler, who co-wrote The Tenth Planet (First Doctor, 1966), The Moonbase (Second Doctor, 1967) and The Tomb of the Cybermen (Fourth Doctor, 1967).
27 May 1983: death of George Cormack, who played King Dalios in The Time Monster (Third Doctor, 1972) and abbot K'anpo Rimpoche in Planet of the Spiders (Third Doctor, 1974).
ii) broadcast anniversaries
27 May 1967: broadcast of second episode of Evil of the Daleks; first appearance of Deborah Watling as Victoria Waterfield. The Doctor and Jamie are transported back to 1866, and Jamie is captured by a mysterious intruder.
27 May 1972: broadcast of second episode of The Time Monster. Stu has been aged by the effects of TOMTIT; the Master evades Benton by tricking him.
27 May 1996: broadcast of Doctor Who: The Movie on BBC (it had already been shown in the USA and Canada).
27 May 2007: broadcast of The Idiot's Lantern. The Doctor prevents The Wire from feeding on the energy of TV owners watching the 1953 coronation. Includes a reference to Belgium.
27 May 2017: broadcast of The Pyramid at the End of the World. An 'ancient' pyramid appears overnight. Every clock in the world begins counting down to the Earth's destruction. Three opposing armies lie ready to annihilate each other. An alien race stands ready to offer humanity a deal that could save them, but enslave them. It is a terrifying race against time to save the world. Will the Doctor be forced to accept their help?