In the distant future a small group of human exiles have been doomed to fight for survival on the edge of the galaxy. Through military strength, espionage and deceit, a unified Terran government has maintained an uneasy peace. As resources run short, however, these Confederate nations find themselves looking towards the rich worlds of their alien neighbours, the enigmatic Protoss. To further complicate matters, it seems that a previously unknown and deadly species known only as the Zerg has entered Protoss space and is destroying everything in its path. The time for war has come...