Blizzard Entertainment's real-time strategy game series StarCraft revolves around interstellar affairs in a distant sector of the galaxy, with three species and multiple factions all vying for supremacy in the sector. The playable species of StarCraft include the Terrans, humans exiled from Earth who excel at adapting to any situation; the Zerg, a race of insectoid aliens obsessed with assimilating other races in pursuit of genetic perfection; and the Protoss, a technologically advanced humanoid species with psionic abilities that attempts to preserve their civilization and strict philosophical way of living from the Zerg. Each of these races is the focus of a series of missions in the single-player campaign of each StarCraft real-time strategy game. In addition to these three, various non-playable races have also been part of the lore of the StarCraft series; the most notable of these is the Xel'Naga, an ancient god-like race which features prominently in the fictional histories of the Protoss and Zerg.
