After terrible explosions, the ruins of the largest cities smoke, combat lasers hit from orbit, UFOs dominate the sky, and enemy troops roam on the surface of the planet, like at home. Cousins ​ ​ Svyatoslav and Stanislav Kraezhogov, who during fishing saw how an unknown aircraft destroyed a helicopter in the air, understood one simple truth: if people surrender, they are doomed. The brothers' hands grow from where they need to, therefore, starting with the manufacture of homemade weapons against aliens, they become indispensable assistants to scientists and designers who build an air defense network throughout the Earth.