"...With Washington, D.C. in the hands of 'The Omega Man' and the full extent of his horrific power revealed, the 'JLA' is forced to make a difficult decision. The 'World's Greatest Heroes' team with the 'World's Worst Villains', aka the 'Crime Syndicate' in order to save both Earths. How will this desperate action be affected by the betrayal of 'Ultra Man' and the reappearance of 'Dark Supergirl' ?..."
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