Nations fall, gods die, and Earth’s mightiest heroes face their ultimate challenge! Iron Man, Thor and Hawkeye form the core of the Ultimates – S.H.I.E.L.D.’s finest fighting force, all too often the only thing keeping the world from total disaster. But when the walls of the mysterious City open up and the hyper-evolved Children of Tomorrow spill out, the Ultimates suddenly find themselves powerless against an unbeatable enemy.