Susan Sheridan (June 17, 1947 - August 8, 2015) was a British actress and voice actress. She is best known for providing the voice of characters in BBC production shows/radio, such as Noddy in Noddy's Toyland Adventures, Princess Sylvia in Muzzy in Gondoland and Trillian in the BBC radio series The Hitchhiker's Guide to the Galaxy Her only known Disney role is Princess Eilonwy in Disney's 1985 animated film, The Black Cauldron.