The star-roving Arkonides had taught Perry Rhodan the secrets of their highly advanced technology, and now his task was to construct a huge starship to open communication between Earth and the mighty Arkonide Empire. But the nations of Earth, in their fear, destroyed the remains of the lone Arkonide ship on the moon - setting off an alarm to summon retaliation from the war bases of the stellar empire. As the massive space-fleet of galactic dreadnoughts headed for earth, its mission to turn the planet into a radioactive wasteland, only Perry Rhodan had a chance of stopping the onslaught. But for how long could the tiny planet of Earth continue to hold off the enormous war-forces of the mighty star empire?