Former Afghan soldier Gleb Yarovtsev, confined to a wheelchair after being seriously wounded, suddenly becomes the focus of attention of a group of recruiters from another reality on Earth. They return Yarovtsev to health on the condition that he becomes a cadet at a special school for space marines. It is to this school that a new cadet ends up, having previously learned that it is located in Ancient Rus'... There Yarovtsev meets representatives of cosmic civilizations, many characters from Russian epics and legends, enters into an uncompromising struggle with the forces of evil, finds himself in the underground kingdom of the dead, finds his lady of the heart - a beautiful princess, helps save the ancient Russian city from destruction.