Starcraft is about a war between three species: the Terrans of Earth, the Protoss of Aiur, and the Zerg of Zerus. These three mighty species have collided in the Koprulu Sector and fight for their very existence. The pages below describe their histories, military units, structures and powers. While reading these materials through, remember that these species are not only fighting one another, they are also fighting civil wars with their own kind. In Starcraft, alliegences and enmities shift with the tides of war and political machinations.