With the world now aware that he is Iron Man, billionaire inventor Tony Stark (Robert Downey) faces pressure from all sides to share his technology with the military. Tony is reluctant to divulge the secrets of his armored suit, fearing the knowledge will fall into the wrong hands. With Pepper Potts (Gwyneth Paltrow) and ``Rhodey'' Rhodes (Don Cheadle) by his side, Tony must forge new alliances and confront a powerful new enemy.