Lex Luthor uncovers the origins of Superman, Wonder Woman, and Green Lantern and sends the Legion of Doom back in time to erase them. Cheetah replaces Wonder Woman, Luthor steals Green Lantern’s identity, and baby Kal El’s rocket is diverted from Earth. After several teammates are captured, Batman discovers evidence of the altered timeline. Using the Justice League computer, the heroes travel back, undo Luthor’s tampering, and restore their friends.