An immigrant. Photo: Warner Bros./Everett Collection You’re not going to believe this, but the superhero whose most famous slogan is “Truth, justice, and the American way” comes saddled with political baggage. James Gunn’s new Superman film , the sixth live-action iteration of the character, hasn’t altered the superhero’s famous origin story in any significant way. But in referring to Superman as “an immigrant,” as Gunn did in an interview last week, the director appears to have scandalized