This add-on for Starcraft expands your playing world with new story lines, weapons, worlds, and music. The game begins as Terran Emperor Mengsk I, having achieved his goal of total power over the human colonies, must now turn his attention to both the rising power of the woman he betrayed--Kerrigan, the infamous Zerg Queen of Blades--and a conspiracy deep within his own ranks. You must have a complete version of Starcraft for this product to function.