Donald Gray

Donald Gray was a South African actor, well known for his starring role in the British TV series Mark Saber, for providing the voices of Colonel White, Captain Black and the Mysterons in Captain Scarlet and the Mysterons, and for being the reason that Donald Marshall Gray changed his name to Charles Gray when he became an actor. Perhaps not coincidentally, in some spinoff media Colonel Whites real name is stated to be Charles Grey.

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Source: Wikipedia