Donald Gray was the stage name of Eldred Donald Tidbury, a British actor who is best remembered in modern times for having provided the voice of the Mysterons in Captain Scarlet And The Mysterons. He died in 1978. This article is a . You can help My English Wiki by expanding it. .Eldred Tidbury was born South African. He was my mother's first cousin. he was selected by Paramount pictures for his good looks!