Circles Of Doom - S1.E7

Captain Black reveals that, using Mysteron technology, that he now has control over all the digital systems on Earth and can destroy them at will. The Mysterons then speak through the rogue agent, demanding mankind's surrender in twenty-four hours or else they will trigger a world-wide technological failure that will destroy everyone on the planet. With humanity's surrender as the price, how can Spectrum carry on the fight with weapons that do not work?