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Superwoman was one of the six main members of the Crime Syndicate in the Earth universe that they inhabited. She had a relationship with fellow team member Owlman, whom she saw as nearly psychopathic as she was if not more. Superwoman was one of the members who favored the use and development of a quantum-powered nuclear weapon that would destroy all life on Earth if the Earth governments refused to relinquish what little power they had left to the Crime Syndicate. However, Owlman had a much more sinister purpose for the weapon: to destroy all realities that have sprung from the one that he called Earth-Prime. Superwoman kept Owlman's personal plans for the weapon a secret, but was evenutally suspected by her fellow teammates when Owlman transported the weapon to Earth-Prime without their knowledge. She and the surviving members of the Crime Syndicate were later brought to justice when Batman transported Owlman and the activated weapon to a cold desolate Earth universe where it would destroy that Earth without harming anyone.
Superwoman in Justice League: Crisis on Two Earths.