The town of Sunset Mason is hidden behind a treacherous stretch of rocky desert land, Hell’s Gate Pass. Peaceful pioneers once enjoyed the seclusion of this town, but it is now overrun by outlaws seeking protection from the law. King Carter, the self-proclaimed ruler of Sunset Mason, works hard to maintain a close relationship between the townsfolk and nearby Indian tribes, while secretly reigning over the growing gang of local bandits. Word reaches Carter that two scouts for the Hartford Transcontinental Railroad have been spotted surveying the area of Hell’s Gate. Realizing that the arrival of the railroad spells the end of his criminal empire, Carter hires a half-breed renegade by the name of Snakeye to lead the Indians on the warpath and wipe out the railroad men.