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Callum Blue played Lord James Marchwood in The Sarah Jane Adventures story The Eternity Trap. One of the higher-profile actors to guest star on The Sarah Jane Adventures, Blue played Mason in Dead Like Me and Zod in Smallville. He has also appeared in The Tudors, Sanctuary and The Princess Diaries 2. He was a regular during season 2 of Billie Piper's series The Secret Diary of a Call Girl.