(duplicate) - PC Games

The player begins the game as a commander of the Precursor starship, who returns to Earth to find it enslaved by the Ur-Quan. It is discovered that the rest of the humans' allies in the war against the Ur-Quan have either been eradicated, put under a slave shield, or put into service as Ur-Quan battle thralls. As the player progresses, it is revealed that the Ur-Quan are fighting an internecine war with the Kohr-Ah, a subspecies of Ur-Quan who believes in eradicating all life in the galaxy, as opposed to enslaving it. The winner of this war gains access to a Precursor starship with unparalleled power.