 Kerrigan serves as the primary antagonist of all but the first and last two games.As "The Primal Queen of Blades", Kerrigan is the "de facto" leader of the Zerg Swarm and mentor to broodmother Zagara.Originally a Terran ghost agent for Arcturus Mengsk, she is betrayed and abandoned to the Zerg, who transform her into a Terran/Zerg hybrid with vast psionic powers under the control of the then unknown Amon.