The pilot receives a radio message about a bomb threat against the plane. Co-pilot Sugisaka checks the passengers' bags for the bomb, which are cleared apart from one man who had no bag. Stewardess Kuzumi opens an unaccompanied suitcase under a bench, finding a rifle. The man pulls a gun on Sugisaka and orders the pilot to fly to Okinawa. He shoots out the plane's transistor radio just as it was breaking the news about a UFO over Japan with Japanese and US Air Force fighters in pursuit. A luminous streaks past overhead, knocking out the airplane's control and causing an engine fire to erupt. The airplane crashes on an uncharted deserted isle.