Justice Lords

History
On an alternate world Lex Luthor was elected president and he killed the Flash (for unknown reasons). In retalliation the League attacked the White House and Superman killed Luthor. He liked this "new way of justice" and the Justice League went rogue. They discovered the reality of the Justice League. They opened a portal to bring them through. They went to their reality and posed as them. Batman battled his alternate self until the good one gave up and used sense and guilt to get the bad Batman to cooperate. He helped them defeat the Justice Lords and went back to hids reality. They later appeared as robots created by Lex Luthor/Brainiac and were easily defeated by the League.