Double Future Trunks

Double Future Trunks' Role In Final Crisis
Double Future Trunks is the Future Trunks that was in the future world of DC X DBZ. His first appearance was in the first scenes of episode 1 "Final Crisis". Double Future Trunks obviously obtained his Super Saiyan 2 form some time within the time period before episode 1. As of now, all we know is that he was left in the future by Lex Luthor. So there's some theories that he was later killed by Garek off-screen. Some say he died after Lex shocked him. None of these have been proven however.