The most powerful world in the Earthly universe is attacked by an unknown golden knight. Despite powerful technologies, humanity loses to the invader, and in just a week, the entire world economy collapses, and the main politicians of Earth-3 find themselves behind bars. The last king of America manages to escape through a portal to the neighboring parallel Earth-4, in which people have been living in goodness and peace for 7,500 years. The Hyperborean Ministry of Defense catches the king and extracts all the information from him. Having learned about the threat, they decide to prepare, but problems turn out to be faster. The Minister of Defense decides to find Excalibur using the latest technology to stop the knight. Secret organizations come to light, the enemies of humanity go over to the good side, only to protect the Earth's universe from the golden invader, but the knight is not so simple even for all the states of Earth-4...