Blizzard Entertainment's military science fiction media franchise StarCraft revolves around interstellar affairs in the Koprulu Sector, a distant sector of the galaxy, with multiple species and multiple factions all vying for supremacy. The real-time strategy video game series is centered on three playable races: the Terrans, humans descended principally from exiles from Earth; the Zerg, a collective of assimilated alien species organized into a biological swarm; and the Protoss, a technologically advanced humanoid species with powerful psionic abilities. Each has distinct units, structures, technologies and methods of production, as well as its own societies and narrative campaigns. Other species important to the setting include the ancient Xel'Naga, whose actions are connected to the development of both the Protoss and Zerg, and Protoss–Zerg hybrids artificially created as part of the plans of the rogue Xel'Naga Amon.