End of the 21st century. The solar system is successfully colonized by people. An unidentified spaceship lands on Mars and disappears from radar. Soldiers from the special security department are sent to search for him. But it turns out that the Wanderer, as the alien is conventionally called, is not the most important problem - there is someone else on the planet, terrible and unpredictable. The platoon commander, Major Glyba, enters into a fight against evil, which turns into a war against everyone.