Collects Universe X #0-7, Universe X: 4, Universe X: Spidey And Universe X: Cap. Earth was saved, and the Celestial danger within the planet's core had been destroyed. Super-humanity had defied its creators and lived to tell the story. But for how long? Earth is on the brink of Civil War, and the surviving heroes of the Marvel Universe are left to fight those they once swore to protect until they can find a cure for the mutated populace. Humanity has become a race unwilling to give up its newfound power, a power that has given way to a war that will lead to the end of all life, as prophesied in EARTH X. It is upon this war-zone world that Captain America and Captain Mar-Vell begin a crusade to collect the world's greatest sources of power and weapons of mass destruction. But is this quest a means to merely protect humanity - or does it somehow serve a greater, darker purpose? Join creators Alex Ross and Jim Krueger in this chapter of the critically acclaimed, award-winning "X" trilogy.