WHOSE SIDE ARE YOU ON?The shocking crossover that rewrites the rules, CIVIL WAR stars Spider-Man, the New Avengers, the Fantastic Four, the X-Men and the entirety of the Marvel pantheon.In the wake of a superhuman tragedy, the proposed Superhuman Registration Act requires all costumed heroes to unmask themselves before the government. Divided, the nation's greatest champions each must decide how to react — a choice that will alter the course of their lives forever. Captain America rejects the Act and goes underground, while Iron Man steps up to spearhead the registration effort — and Marvel's heroes split!