Justice League: Crisis on Two Earths

Lex Luthor and a heroic analogue to The Joker named The Jester are securing a piece of technology at a secret lair of the Crime Syndicate, an evil version of the Justice League. After securing the unknown device, Luthor and The Jester attempt to escape, only to have the Jester sacrifice himself while killing J’edd J’arkus (a Martian Manhunter analogue), and Angelique (a Hawkgirl analogue). Lex Luthor is then confronted by the Syndicate, only to escape to the Earth of the heroic Justice League.-Wikipedia.