In America, sometimes being a hero means breaking the rules. From the beginning, superheroes like The Hulk, Black Panther, Iron Man, Luke Cage, Wolverine and The X-Men have challenged authority and fought for outsiders, in battles that reflect the country's most profound real-world divisions and struggles. From their often controversial origins to recent resurgence in today's blockbuster movies, these rebels continue to redefine heroism for new generations.