在十九世纪的美国与墨西哥战役中,陆军上尉约翰鲍尔因为表现懦弱,被军方派往荒芜的内华达山脉前哨基地驻守,与一群乌合之众的劣等士兵过着无聊透顶的生活。后来一名苏格兰男子艾维斯闯入了军营,他交代自己本来与一队人同往此地,但在途中遇大风雪,众人躲到山洞中栖身。在饥寒交逼下,他们竟互相残杀吃起人肉来,只有艾维斯逃出这个疯狂的山洞。鲍尔上尉闻讯后带队到山洞查察,不料艾维斯竟然是食人魔。本片的故事看来像是低劣的血腥恐怖片,其实拍得相当严肃,对战争与生存的主题有发人深省的探讨。导演安东尼亚贝特的快节奏处理毫不拖泥带水,后段更拍出了黑色喜剧感。两名主角盖皮尔斯和劳勃卡莱尔都演出特色。Captain John Boyd receives a promotion after defeating the enemy command in a battle of the Mexican-American War, but because the general realizes it was an act of cowardice that got him there, he is given a backhanded promotion to Fort Spencer, where he is third in command. The others at the fort are two Indians, George and his sister, Martha, who came with the place, Chaplain Toffler, Reich, the soldier; Cleaves, a drugged-up cook; and Knox, who is frequently drunk. When a Scottish stranger named Colquhoun appears and recovers from frostbite almost instantly after being bathed, he tells a story about his party leader, Ives, eating members of the party to survive. As part of their duty, they must go up to the cave where this occurred to see if any have survived. Only Martha, Knox, and Cleaves stay behind. George warns that since Colquhoun admits to eating human flesh, he must be a Windigo, a ravenous cannibalistic creature.