This book describes how Skeletor lived on Infinita, Eternia's dark and warlike sister planet, and how up until now he had been held back from conquering the planet because the space portal that linked the two had been sealed. He carries out a plan to capture Grayskull by holding Teela hostage, threatening to hurl her into space towards Infinita if He-Man doesn't comply by giving him the Power Sword. This book also mentions that the Sword of Power is only powerful in the hands of the defender of Eternia. This was preordained by the Council of Elders, long ago. In anyone else's hands, the sword is useless and burns anyone evil who attempts to possess it. Skeletor grabs the sword and drops it instantly because it had grown white-hot, and in that same instant Battle Cat knocks him into the space portal back to Infinita.