A colossal ancient beast rises from Pacific deepsea, triggering global tsunamis and mass destruction. Human military forces launch strikes yet fail to kill it. Dr. Lin Ya discovers the creature follows geothermal routes, carrying a glowing golden energy core inside its body. Major Feng Kai leads ground troops to attack its vulnerable eyes and ears to cripple the monster. A second beast breaks out, and the two titans wage brutal urban combat. Humans harvest alienlike body materials of the dead beast, uncovering implanted signal beacons that rouse more dormant giants. Mankind builds a giant mech powered by captured cores to fight incoming threats, while deeper underground, more abyssal creatures await awakening.
