Iron Man and Captain America: two core members of the Avengers, the world's greatest super hero team. When a tragic battle blows a hole in the city of Stamford, killing hundreds of people, the U.S. government demands that all super heroes unmask and register their powers. To Tony Stark-Iron Man-it's a regrettable but necessary step. To Captain America, it's an unbearable assault on civil liberties. SO BEGINS THE CIVIL WAR. BASED ON THE SMASH-HIT GRAPHIC NOVEL THAT HAS SOLD MORE THAN HALF A MILLION COPIES.