For years, UFO sightings have been documented around the world. What were once mere sightings have now become brutal attacks of epic proportions. As the human race faces total annihilation with every major city destroyed only Los Angeles remains. Left with the task of saving humanity from extinction, a group of cowboys is the world s last stand in this Alien Armageddon.

It is the 30th millennium. Humanity is caught in the midst of a fratricidal war between those of the meta-human Space Marines who are loyal to the Emperor, and those who no longer are.

The once noble warriors of the XII and XVII legions are cutting a bloody path throughout the realm of Ultramar, committing boundless atrocities out of sheer spite and hatred for their cousins belonging to the XIII legion.

In this episode we gain a glimpse of the aftermath of the battle on planet Sathus, and the living nightmare taking place on a starship manned by traitorous legionaries, as they bide their time on the approach to planet Calth.