Plot: The mission for Captain Taverner and his squad of North American Federation (NAF) soldiers is simple: search and destroy invading aliens on a distant planet to prevent them from stealing a mineral which is a vital source of energy for earth, and a vital source of profit for the NAF. To guard against infection from the hideous bug-aliens, the soldiers are forced to inject special genetic drugs; however, the mission becomes complicated when Lieutenant Rosen is wounded in a firefight with the aliens