Collects Ultimate Comics X-Men #29-33. "World War X" begins! It's Tian vs. Utopia when Jean Grey takes on Kitt y Pryde! Will the planet be torn apart when the two mutant nations go to war? Alliances are broken, sides are chosen and betrayals abound - but after a sneak attack on Utopia, and Jean's strict warning that the rest of the world should stay out of the war, will the global mutant-on-mutant conflict finally unite…or divide mutants forever? As World War X claims its first casualties, Kitty Pryde becomes a revolutionary redux, Mach Two displays startling new powers, and James Hudson proves he's more than just his father's son!