Tony Stark arrives in Japan to help implement his goal of world peace by building the Arc Reactor, a carbon-neutral power plant that, once operational, will be able to provide limitless (thus free) energy to the world. Set to retire his Iron Man persona, and about to mass-produce a line of Iron Man armor known as "Iron Man Dio", Stark's plans are derailed by a series of high tech Mech monsters. Zodiac, a top secret organization funded by the terrorist group A.I.M. is out to disrupt the Arc Station, steal the Dio armor and put an end to Iron Man. The Armored Avenger's fight is only just beginning.