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.

以火车为主要叙事舞台的影片中，约翰．弗兰肯海默导演的这部战争动作片是令人难忘的杰作。故事时代背景是二次世界大战末期，德军眼看大势已去，深黯艺术无价的德国指挥官保罗．斯科菲尔德乃下令将一批法国名画从博物馆搬回德国去。负责驾驶这列火车的司机伯特．兰卡斯特在严密监视下，仍跟法国铁路局人员及地下游击队配合行动，用鱼目混珠及瞒骗等种种方式跟德军斗智，力保国宝不致流出国境之外。全片剧情结构严谨，气氛处理紧凑生动，常有令人捏一把汗的精彩场面出现。两位男主角的表演旗逢敌手，张力十足，也表现了各自的爱国心。