Sylvia Slitheen
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"Sylvia Slitheen" is a title based upon conjecture.
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Sylvia Slitheen was a member of the Passameer-Day Branch of the family Slitheen that tried to destroy Earth in 2006. She posed as the chairman of the North Sea Boating Club, Sylvia Dillane. She was killed when a missile hit 10 Downing Street. (TV: World War Three)