User blog comment:Nardragon/Justice League 2015/@comment-3969416-20121110133637

Instead of going the Alien route, they should have a powerful magical threat for Earth, like Felix Faust or Morgaine le Fey. They unleash hell on earth, which draws such very different heroes together. Superman can't deal with it alone because he's vulnerable to magic like kryptonite. Wonder Woman knows all about magic, whereas heroes like Batman and the Flash have a hard time believing in things that are not of science. GL, the Martian, and Hawkwoman are already strangers on this world, so they try to take the demonic armies with stride.