The three fiercest species in the universe have been locked in a bloody, galaxy-spanning battle for years. With each new encounter, it seems the on-going conflict will never end. After a small unit of Colonial Marines, dispatched to planet LV-742, reveals the presence of both Predators and Aliens, it is decided that the conflict must end once and for all. After years of smaller battles, there is only one clear path to total universal supremacy, WAR! You must now defeat your enemies to ensure the survival of your species... or face Extinction.