Tess Mercer was born as Lutessa Lena Luthor and was the sister of Lex Luthor and the daughter of Lionel Luthor. She became a Checkmate agent and after Lex's disappearance, she took over LuthorCorp. Tess also became the second operator of the Watchtower and a member of the Justice League, but was murdered by her own brother. Months later, it was discovered that Tess's spirit is caught in Lex's mind and was freed by her friends later.
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