This is what The Watcher has been watching for. A danger older than the planet threatens everything. The age of technology is about to end -- and for once, the heroes who have saved Earth time and again find themselves almost completely powerful in the face if it. X-Men and Avengers will assemble. Spider-people and the Fanstastic Four will come together. Heroes for Hire will fight alongside Champions. But none of it will be enough. The lights are about to go out. The world outside our window... is about to end. And after darkness comes Apocalypse!.