Weakened by endless wars and environmental disasters, humanity has become easy prey for the dark princes invading from outer space. Navigator Gleb Tanaev, who died and was reborn on distant Elan, is the only one who can save the ancestral homeland of people. He will have to overcome the fierce resistance of the new rulers of the Earth, and then master the path leading to the gates of another world in order to regain the Sword of Prometheus and free his home planet from evil spirits.