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.

A medic gets help from the animal kingdom to reach his patients.