Long ago four supercarriers loaded with political dissidents and convicts from Earth crash-landed on the distant planets of Tarsonis, Moria, and Umoja.
These hardy and resourceful terrans established colonies and eventually spread to other planets. In time the largest and most technologically advanced of the colonies, Tarsonis, founded a powerful yet oppressive government called the Terran Confederacy.
A bloody rebellion ignited against the Confederacy, led by an ambitious and charismatic ex-prospector named Arcturus Mengsk.
Yet as Mengsk and his Sons of Korhal strove to liberate their terran brethren from the yoke of oppression, a far greater conflict loomed on the horizon….
Humanity first learned that it was not alone in the universe when a gleaming fleet of protoss warships emerged over the Confederate planet of Chau Sara and incinerated its surface without warning.
On Chau Sara’s sister planet, Mar Sara, Marshal Jim Raynor found evidence of a second alien presence. Attacks broke out across the planet, and it took the Sons of Korhal to mount any kind of organized resistance to the aliens, which had now become known as the zerg.
Jim Raynor and the rebels evacuated as many people as possible from Mar Sara before the mysterious protoss fleet reappeared and incinerated the planet.
Thoroughly disillusioned with the Confederacy, Raynor joined the Sons of Korhal. On the planet of Antiga Prime, he worked with Mengsk’s second-in-command, Sarah Kerrigan – formerly an elite assassin for the Confederacy – whom Mengsk had liberated from the government’s neural conditioning. Despite a rocky start, Raynor and Kerrigan quickly formed an efficient partnership.
Mengsk stirred up a full-scale revolt against the Confederacy on Antiga Prime. He then employed a psi emitter – a Confederate-designed device that acted as a beacon for the zerg – to destroy the Confederacy’s forces. Soon afterward the protoss incinerated Antiga Prime from orbit, just as they had done to Chau Sara and Mar Sara.