The film tells about a portable, very economical stove and about its creator - inventor K.M. Maslov. Director of the film studio "Tsentrnauchfilm" S. Valov at home talks about the idea of the film "Potbelly stove of the XXI century" and the hero of the film - the inventor KM Maslov (synchronously). People queue up at the entrance to the Sausage store. People queue up for laundry soap near a street counter. Speech by a rock band on the concert stage (synchronously). Iron stove "potbelly stove" in the interior of a city apartment. Firewood is burning in the stove. Inventor K.M. Maslov talks about his stove (synchronously). KM Maslov smokes fish, fries meat, heats pasties on his stove. KM Maslov on a picnic with friends near the tent. Cover of KM Maslov's book "Inventing for the Joy of People". KM Maslov with assistants examines the letters of readers. KM Maslov in the greenhouse examines and weighs tomatoes grown according to his own method. Portable stove "Smoke". KM Maslov critically assesses the stove "Dymok", manufactured at the plant "Vyatskiye Polyany" (synchronously). Steel tanks of the oil storage. Oil pipelines in a trench. Industrial area of Novokuznetsk. Smoke pipes of a metallurgical plant. Shield with the inscription: "You are welcomed by the twice-decorated Novokuznetsk." Schoolchildren and a teacher in gas masks are walking down the street. A section of a gas pipeline transporting gas from Russia to Europe. Newsreel footage: a rocket at the cosmodrome before launch; the fighter falls into the stadium and explodes; when the fighter falls, the pilot is ejected.