Operator #5 V15: Invasion of the Yellow Warlords

Out of the East, eight centuries ago, the first Mongol Horde rode forth under the mighty Genghis Khan, and became the first 'yellow threat' to the West. Now a new one has reared, to which that ancient invasion stands as a mere escapade. High-explosives! Deadly bacteria! Poison gases! Flaming thermite! The greatest cities in the West lying in smoking ruins; invaders gutting the very heart of our nation! How can Operator 5, betrayed, condemned, hunted by his own countrymen, fight both them and the enemy? How can he save, from a subjection more horrible than death, the beloved land of his birth?