The StarCraft: Brood War expansion adds a host of new features to the game, including three new campaigns set in the aftermath of the original StarCraft. Explore new worlds, fight your way through dangerous missions, and command powerful new units for each race. Brood War takes place in Chris Metzen's StarCraft universe, set around the early 26th century. Terran exiles from Earth have colonized a distant area of the Milky Way galaxy called the Koprulu Sector, having established several governments. Eventually, a civil war breaks out and ends with the formation of the Terran Dominion. However, humanity soon becomes caught in a war between the Protoss and the Zerg, which culminates at the end of StarCraft with the death of the Zerg leader, the Overmind, on the Protoss homeworld of Aiur. Without the Overmind to command, the Zerg rampage mindlessly across Aiur, while the cerebrates—the secondary commanders of the Swarm—attempt to regain control.