It's been six months since the world learned that billionaire inventor Tony Stark is the owner of Iron Man's unique cyber armor. The public demands that Stark hand over the armor technology to the U.S. government, but Tony doesn't want to divulge its secrets because he's afraid it will fall into the wrong hands.
Meanwhile, Ivan Vanko, the son of a Russian scientist who once worked for Stark's company but was fired and deprived of everything, is determined to avenge Tony for his family's troubles. For what he builds his own high-tech weapon.