The mad Emperor, warrior descendant of the ravagers of Asia, unleashed a new, horrible, ingenious weapon against the American people. While slant-eyed Mongols bent over a powerful death-machine, a thousand miles away, the air became unbreathable! Men and women and children — all living things — gasped for life-giving oxygen, and with searing, heaving lungs, fell strangled by the mysterious, deadly element. Against these demoniacal hordes, one man alone — Operator 5 — struggles while red revolt and destruction blasts America!