A violent thunderstorm floods London. Florida is laid waste by hurricanes. Somehow the Mysterons are controlling the world's weather, and only Spectrum can stop the devastation. Captains Scarlet and Blue head into space aboard Fireball XL19 to destroy a weather-control satellite that has been taken over by the Mysterons—only to discover that the real cause of the destruction is much closer to home. As Scarlet and Rhapsody Angel confront the mastermind behind the latest Mysteron attacks they discover the true scope of his plan, and if they cannot stop him then the Earth faces certain climatic catastrophe.