A good version of Lex Luthor from a parallel Earth comes to the Justice League's dimension for help to fight their evil counterparts.
The movie begins in a alternate universe where Lex Luthor (Chris Noth) and a heroic analogue to The Joker named The Jester (James Patrick Stuart) 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 Hawkwoman analogue. Luthor is then confronted by the Syndicate, only to escape to the Earth of the heroic Justice League.