Civil War The epic story that blows the Marvel Universe apart! Iron Man and Captain America: two core members of the Avengers, the world's greatest super hero team. After a tragic battle in Stamford Connecticut, 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.