The Mars Frontier comprises the geography and the expression of life in the forward expansion from the original developed cities of the planet Mars following terraforming in the late 21st century. Many people living in the Mars Frontier are cut off from the rest of the planet, and indeed the rest of the 'Continuum, as many do not have advanced technologies, and are generally overlooked by the Commonwealth of Allied Planets, resulting in a unique governing and law enforcement system very similar to that of the 'Old West back on Land-That-Was.