Superman accidentally kills his wife, Lois Lane, and his unborn child, when he thinks he's fighting Doomsday, as well as destroying Metropolis with a nuke set up by the Joker, who he kills. This leads him down a dark path that there might not be any redemption from. Lex Luthor teleports the Justice League from another Earth onto the Earth where Superman has had a totalitarian grip for years. He brought them here in the hopes that they (along with the Insurgency on this Earth) can bring down Superman and his Regime for good.
