The alternative version of Superman from a parallel Universe.
The Justice Lords are anti-heroes who first appeared in the two-part Justice League episode, "A Better World" (airdate November 1, 2003...on my birthday).
The Justice Lords' world diverged from that of the Justice League when their Lex Luthor was elected President of the United States. The Flash was executed personally by Luthor for unknown reasons, and Luthor's policies eventually resulted in the country "being on the brink of a war that could destroy the whole planet". The alternate Batman, Superman, and Wonder Woman decided to try and stop the impending war, storming the White House and confronting President Luthor. After Luthor goaded the alternate Superman, that no matter how many times Superman sent him to prison Luthor would find a way back into power all over again in an unending cycle, the enraged Kryptonian targeted Luthor with heat vision and killed him. This decision led to far-reaching consequences, as Superman decided he liked this new brand of "justice". Soon, the other Lords lost faith in humanity's ability to do what was right, as well as their own moral compasses.