Justice Lord J'onn J'onzz's background was the same as his Justice League counterpart (coming from the planet Mars) until President Lex Luthor executed the Flash. After Justice Lord Superman killed the President, J'onn took part in bringing peace to Earth by placing it under the harsh rule of the Justice Lords. At some point during this period, J'onn changed his costume and replaced it with a new one.
Meeting the Justice League
When Justice Lord Batman revealed his interdimensional transport device to the other Justice Lords, Justice Lord J'onn J'onzz was able to see a universe where their counterparts dubbed themselves "Justice League" as continued to battle Lex Luthor as a criminal alongside the Flash still alive but also never took control of Earth. He then took part in the planning to transfer the Lords' brand of justice to the universe of the Justice League, though he mused an apology to the League shortly beforehand. After the capture of the Justice League, J'onn traveled to their universe with the other Justice Lords, except for Batman. Almost immediately, they found themselves battling Doomsday, with J'onn putting up a decent fight against the big brute. Soon after, the Justice Lords occupied the Justice League's Watchtower. When they were alerted that Luthor had escaped from prison, Lord J'onn and the other Lords left the Watchtower to deal with him. When the Lords arrived, however, they found themselves greeted by the League's J'onn J'onzz in the same fashion he did for the League. After a short "apology" from his counterpart, the Justice Lords found themselves in the same trap they had set for the league. Upon escaping the trap courtesy of Justice Lord Hawkgirl, the Justice Lords engaged the League with each member battling their respective counterparts. Lord J'onn fought his Justice League counterpart, both using their shape-shifting abilities to transform into monstrous forms to battle one another (with Lord J'onn using noticeably more vicious and animalistic forms to fight). The two Martians continued their aerial fight until it was ended when Luthor targeted Justice Lord J'onn with his energy disruptor, depriving him of his powers. Soon after, he and the other Justice Lords were returned to their own universe.
During the final hours of the Cadmus Crisis, the fused form of Luthor and Brainiac created an android replica of Justice Lord J'onn J'onzz. But the android was quickly destroyed by J'onn J'onzz.
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