Divji zahod, leto 1873. V puščavskem mestecu Absolution se nenadoma znajde neznanec brez spomina. Edina zgovorna podrobnost je ta, da na zapestju nosi skrivnostno zapestnico, za katero pa žal ne ve, kako se uporablja. Ko sreča tamkajšnje meščane, neznanec kmalu spozna, da ti niso vajeni tujcev in da živijo v strahu pred neusmiljenim polkovnikom Dolarhydom in njegovim sinom. Toda ko se nad puščavo nenadoma prikažejo vesoljske ladje, ki začnejo ugrabljati prebivalce, morata Dolarhyde in neznanec združiti moči in mesto rešiti pred vesoljsko invazijo. Spotoma neznanec odkrije, kako mora uporabljati nenavadno zapestnico.
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.