It has been fifteen years since Captain Chris Myers used his giant mech to draw the kaiju of North America into each other's territory to have them destroy each other. Once all of the kaiju had battled to the death only Atomic Rex was left standing. In Antarctica, the kaiju known as Armorsaur has entered the frozen valley of the yetis and attacked them. Devouring all but one alpha male yeti who was exposed to the kaiju's blood and left dying in the snow. The yeti awoke to find himself transformed into a kaiju with an obsession to destroy Armorsaur. Chris and Kate are forced to protect the people of their settlement by drawing Atomic Rex into South America where he will battle the kaiju there to usurp their territory and claim their hunting grounds as his own. As Atomic Rex enters South America from the north the enraged Polar Yeti enters the continent from the south. The two most powerful kaiju in the world will battle their way through a multitude of giant monsters as they are set on a collision course with each other!