The world was introduced to the first iteration of the Justice League back in March 1960 in The Brave and the Bold #28, and since then, the superhero team has become one of the most beloved properties in comic book history. Although individual members of the League have been adapted to film and television since the group's conception, Zack Snyder and Joss Whedon's recent pic is the first time that DC Comics' greatest heroes have come together on the big screen.