Clay Hardin, a Deputy U.S. Marshal, is about to turn in his badge and take the job as the territory's Indian commissioner until the notorious Ben Thompson slays the marshal when he tried to make an arrest. Clay turns his back on a white-collar job and his girl to pursue the gang. Picking up a bounty hunter and a beautiful half-breed woman along the way, the little band follows the trail into Apache land where the lawman discovers that the outlaws plan to sell repeating rifles to the Indians.

A mad doctor uses patients at his isolated psychiatric institute as subjects in his attempts to create longevity by surgically installing an artificial gland in their skulls.

新墨西哥州，1879年8月。被阿帕奇人无情地屠杀的骑兵纵队中为数不多的幸存成员试图到达克莱恩堡。在穿越一片充满敌意的土地的路上，痴迷而无情的文森中士将他指挥下的士兵们的意志发挥到了极限。