Superhero has become an important consideration about concepts of heroism in American society. As a popular culture product, the superhero has spread beyond comic books and appeared in movies. It also becomes interesting discussions academic study. One of the discussions among the scholars is about vigilantism. To move the discussion further, this research examines examine a postmodern superhero as a vigilante in the context of Michael Foucault’s subject and power relations. By taking into account what Foucault advocates in his theory of the subject and power relations, the status of Iron Mas as a superhero or a vigilante is revealed by examining the discourse. As a result, Iron Man who presents an ambiguous status – whether he is a superhero or a vigilante – is a superhero from the discourse perspective. He can be considered as a superhero due to following the discourse of superhero that is promoted by the society.