Maciste and his people flee their volcano-ravaged island. They end up caught in between two warring tribes.

Spaghetti Western icon Anthony Steffen stars as Shenandoah, a man of mystery who joins a vicious band of highwaymen after passing a near impossible and death defying initiation. When the gang begins to suspect Shenandoah may be a traitor in their midst; they learn the real reason he joined their degenerate gang of thieves: retribution.