In the year 2284, after many years of a war between the Terran forces and the forces of former Earth colony Mendel, the United Terran Forces have plans to invade Mendel and has chosen the previously uncolonized world Epsilon Eridani F to be their staging base. The super Battlecruiser Atlas was sent to the region to construct spaceport facilities, but was seized by a deadly weapon. The marines have been called back to save the ship, but the infection is becoming more entrenched. The final dropship has been sent, carrying a group of 5 battle hardened space marines.