Bruce Wayne (DC Comics Earth-22)

The Batman Who Laughs is the Bruce Wayne from Earth -22 of the Dark Multiverse. He was a lieutenant of Barbatos and leader of the Dark Knights. After their defeat, he helped Lex Luthor learn about the origin of the Omniverse while also hatching another plan to infect the whole world like him and infected a group of heroes to utilize in his plans, terming them the Secret Six.