Picking up where the first film left off, Tony Stark/Iron Man have become a deterrent to those who would wish to attack America. Thanks to that, the government wants the armor turned over to use as a weapon. As the struggle between the two entities heats up, a new bag guy emerges with technology similar to Iron Man's. Tony now has to discover how his technology was copied as he also searches for a new power source that won't slowly kill him as he uses the armor.