While driving through the desert with his wife Carol Marvin to a military base to send the eleventh rocket to the orbit of Earth for helping the exploration of the outer space in the Operation Sky Hook, Dr. Russell A. Marvin and Carol see a flying saucer and accidentally records a message in their tape recorder. Once in the base, Dr. Russell is informed by his father-in-law and general that the ten first satellites had mysteriously felt on Earth. When Dr. Russell decodes the message, he encounters the aliens that ask him to schedule a meeting with the leaders of Earth in Washington in 56 days with the intention to invade Earth without panicking the population. Dr. Russell develops an anti-magnetic weapon that becomes that last hope of human race against the hostile aliens
特别喜欢飞碟的声效，嗖嗖嗖，以及如潮湿虫一般的外星人，解下白板面罩以后，居然是一幅ET外星人的容貌，可见此片影响了不少科幻电影，发现雷.哈里森（RAY HARRYHAUSEN）参与的电影结局都有一个套路，就是把怪兽，飞碟等“反派”往大城市引，往著名建筑（特别是政府的）上引，这样做的结果是总是可以做到房屋倒塌，土崩瓦解的特效，还利于怪兽攀岩出逃，勇猛闪避等功效，就像早期的国产枪战片，最后算总账的场地总在废旧的破比工厂一样，难道哈里森以此发泄对政府的不满？