When Superman and others form a new, powerful version of the Justice League of America, Lex decides this is Superman's direct challenge to his own power, so he creates a new Injustice Gang in response. Along with his new teammates, Lex acquires a powerful artifact known as the Worlogog, which can warp space and time. The Injustice Gang kills several people while attacking the League then lures the heroes into a trap, but then is defeated. The Joker gains control of the Worlogog, but is then telepathically attacked, becoming temporarily sane and remorseful. Before the killer's mind reverts, Luthor has Joker use the Worlogog to revise history so that those killed no longer died. With the deaths removed and little physical evidence linking him to any wrongdoing, Luthor is free to go. While Batman concludes Luthor simply used Joker to avoid murder charges, Superman believes it is a sign Luthor does not truly desire the deaths of innocents and still has the potential to be a good man.