For the first time in recorded history, humanity has developed the technology to travel among the stars. The unrestricted exploration of space begins, only for our first wave of pioneers to discover abruptly and brutally, that we are not alone in the cosmos. It will be up to the Space Marines not only to counter this new threat from far, far way, but also to prevent these bizarre new enemies, the Roaches, from finding Earth and bringing their unforgiving brand of destruction down on all of us.