KILLZONE KILLS ALL
Repel an attack by the invading Helghast--or die trying--in Guerilla's Killzone.
Killzone's premise is one of its strongest points, though the story itself isn't told particularly well and fails to expand upon its most interesting aspects. At some point in the future, humankind colonized space, and a militant splinter group broke away and settled on the planet Helghan. These colonists were slowly changed by their new world's atmosphere over a period of years until they effectively became an entirely new race: the Helghast. After a bitter war and subsequent period of isolation, the Helghast forces rebuilt themselves and began a new assault on humanity, starting with the nearby world of Vekta. It's up to you, of course, to fight off this invasion and stop the Helghast from realizing their plans of dominion.