The world is on edge. An alien attack force is on its way. Our defenses are few and far between. Our technology and experience lags far behind. Will the nations of the world be able to provide a united front against our enemies? Will we overcome our mistrusts of one another and work together for our common defense? Discover the fate of the world by following a new team of Space Marines from their first journey into space and beyond. The first major battle for Mankind is about to begin...