Joker (Year X)

Origins
When The Joker killed The Justice League Batmanlost his humanity and sanity he'd beat The Joker to death and became the Judge, jury, and executioner, eventually The Joker was resurrected by a gang against Batman's authority and enforcement.

The Joker surprising Batman by his return on Gotham City, gave him the upper hand, but was defeated again by The Caped Crusader, enraged The Joker was he also resurrected one of Bat's friends Superman from there Year X ended and Batman rebuilt The Justice League and resurrected his teammates