1873年的美国西部,杰克·洛根(丹尼尔·克雷格 Daniel Craig 饰)突然醒来,发现自己身处荒漠。自己为什么会在这儿,完全不记得了,身上仅有手腕上的一个神秘金属装置。为了找回失去的记忆,杰克回到了小镇上。但是他发现小镇上的居民对他却不怎么友好,而且想要在小镇上呆下去,必须得到伍德罗(哈里森·福特 Harrison Ford 饰)这位小镇开拓者的首肯才行。可是,最恐怖的事情却发生了,几艘诡异的外星飞船突然出现,并用劫掠走了小镇上的很多人。这时,杰克突然触动了手腕上的金属装置,将一艘外星飞船打了下来,并组建找回了部分记忆。为了救回被抓走的人们,查明这些不明外星飞船的意图。小镇上团结起来,在杰克和伍德罗的带领下,向着外星飞船飞走的方向,去寻找答案。The Old West.. where a lone cowboy leads an uprising against a terror from beyond our world. 1873. New Mexico Territory. A stranger with no memory of his past stumbles into the hard desert town of Absolution. The only hint to his history is a mysterious shackle that encircles one wrist. What he discovers is that the people of Absolution don't welcome strangers, and nobody makes a move on its streets unless ordered to do so by the iron-fisted Colonel Dolarhyde (Ford). It's a town that lives in fear. But Absolution is about to experience fear it can scarcely comprehend as the desolate city is attacked by marauders from the sky. Screaming down with breathtaking velocity and blinding lights to abduct the helpless one by one, these monsters challenge everything the residents have ever known. Now, the stranger they rejected is their only hope for salvation. As this gunslinger slowly starts to remember who he is and where he's been, he realizes he holds a secret that could give the town a fighting chance against the alien force. With the help of the elusive traveler Ella (Olivia Wilde), he pulls together a posse comprised of former opponents-townsfolk, Dolarhyde and his boys, outlaws and Apache warriors-all in danger of annihilation. United against a common enemy, they will prepare for an epic showdown for survival.