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The action of the movie takes place during a possible future war. A foreign state is preparing an attack on the Soviet Union. Professor Runge in his laboratory conducts an experiment with a new deadly gas. The plan of aggression is carried out. On a major Soviet industrial center the enemy command sends squadrons of planes with high-explosive and chemical bombs, with an airborne landing force led by White Guard officers.
Nikolai Bogolyubov
Ognev, chief of Sovier air defence
Sofya Sokolova
Galina, Ognev's sister
Boris Livanov
Karl Runge, engineer
Nikolay Podgorny
Professor Runge
Lev Fenin
General Vahr
V. Lavrentyev
Colonel Massalskiy
Aleksandr Antonov
Chief of aviation
Georgy Bobynin
Staff captain Blagonadyozhnyh
Konstantin Chugunov
Master Akim Ivanovich