20 April 1951: birth of Louise Jameson, who played the Fourth Doctor companion Leela from 1977 to 1978. She is 70! It doesn’t seem possible!
ii) broadcast and publication anniversaries
20 April 1968: broadcast of sixth episode of Fury from the Deep; last appearance of Deborah Watling as Victoria. The seaweed creature is destroyed by Victoria's screams, and she decides to stay behind.
20 April 1972: publication of The Making of Doctor Who by Malcolm Hulke and Terrance Dicks, the first book about the show.
20 April 1974: broadcast of fifth episode of The Monster of Peladon. Eckersley's treachery is revealed.
20 April 2007: broadcast of third episode of The Infinite Quest.
20 April 2013: broadcast of Hide. Clara and the Doctor arrive at the haunted Caliburn House, set alone on a desolate moor. Within its walls, a ghost-hunting professor and a gifted empathic psychic are searching for the Witch of the Well. Her apparition appears throughout the history of the building, but is she really a ghost? And what is chasing her?