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Tess Mercer, birth name Lutessa Lena Luthor, was one of Lex Luthor's loyal employees. When he disappeared in Smallville, season 7, she took over his business to attempt to find and help him. She also began living in the Luthor mansion. She later discovered in season 10 that she's actually Lex's sister, Lutessa Lena Luthor, and the daughter of Lionel Luthor.