Following the aftermath of a world war, you aided the Emperor in rebuilding the empire. However, the looming threat of returning aliens remains largely ignored, dismissed as mere mutants by the populace. Despite your human appearance, you've been genetically enhanced to surpass the capabilities of ordinary humans, alongside other modified groups like the Eternals and Neohumans. Your friends Chien, Joanne and you were the only survivors of the last war's final epic battle, where you've heard the ominous declaration of the aliens' impending return. As the revered war hero and the Emperor's Sentinel, you embark on an unofficial quest to prepare the Earth for the imminent invasion. Assemble a formidable task force of Earth's finest warriors, uncovering and researching plans for space invaders' defense. The fate of humanity rests in your hands.