The town of Newnan are seeing little green men everywhere. The military have arrived and are on the lookout for UFOs. Everyone's high strung and Sheriff Hall (Bud Spencer) is left to deal with the aftermaths of the hysteria. On his way home from patrol he happens upon a little boy claiming to be an alien by the name of H7-25. At first the sheriff doesn't believe the boy, but with the mounting evidence, even he must eventually concede. Soon the military is after Sheriff Hall and H7-25, and it is up to the sheriff to keep the boy safe and beat up large swaths of soldiers so H7-25 can go home.

本片根据美国作家杰克.伦敦小说改编。在十九世纪末的美国阿拉斯加曾经掀起一阵淘金热潮。幸运者往往成为巨富，而不走运者不但金沙捞不到，反而在你争我夺的竞争中丧生。这个发生在阿拉斯加幸福镇的故事，就充分反映了这种血淋淋的争夺。