Ysanne Churchman

Ysanne Churchman (born 14 May 1925 in Sutton Coldfield) voiced Alpha Centauri in the Doctor Who television stories The Curse of Peladon, The Monster of Peladon and Empress of Mars, and Lupton's Spider in Planet of the Spiders.

She retired from acting in 1999 at the age of seventy-four. Despite this, she returned to the role of Alpha Centauri in 2017, at nearly the age of 92. She is the only guest actor (i.e. not a series regular) to play the same role in both the classic and revived series.