The inhabitants of the British village of Midwich suddenly fall unconscious, as does anyone entering the village. The military establishes a cordon around Midwich and sends in a man wearing a gas mask, but he, too, falls unconscious and is pulled back with rope. The man awakens and reports experiencing a cold sensation just before passing out. The pilot of a military reconnaissance plane is contacted and asked to investigate. When he flies below 5,000 feet, he loses consciousness and the plane crashes. A five-mile exclusion zone around the village is established for all aircraft. After approximately four hours, the villagers regain consciousness, and all are apparently unaffected.