美国一个只有二千居民的小镇，突然在上午十时一致陷入昏迷，美国联邦政府派遣病理学家柯斯迪．艾黎前往当地负责调查此事，但并无结果。数小时后全镇恢复苏醒，但怪事从此不断发生。首先，是所有妇女都同一天怀孕，包括处女在内。其后，她们在同一天生下来的孩子都变成一头白发，并且具有超自然杀伤力量的异种。镇上的医生克里斯托弗．里夫是其中一个孩子的父亲，他经过长期观察和努力之后，发现他们是缺乏“人性”的外星移……
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George Henry Sanders (3 July 1906 – 25 April 1972) was a Russian-born English film and television actor, singer-songwriter, music composer, and author. His career as an actor spanned more than 40 years. His upper-class English accent and bass voice often led him to be cast as sophisticated but villainous characters. He is perhaps best known as Jack Favell in Rebecca (1940), Scott Folliott in Foreign Correspondent (1940) (a rare heroic part), Addison DeWitt in All About Eve (1950), for which he won an Academy Award, King Richard the Lionheart in King Richard and the Crusaders (1954), Mr. Freeze in a two-parter episode of Batman (1966), the voice of the malevolent man-hating tiger Shere Khan in Disney\'s The Jungle Book (1967), and as Simon Templar, \"The Saint\", in five films made in the 1930s and 1940s.