 However, supplanting the cerebrate with another entity could allow broods, or other large groups of Zerg, to be controlled by non-Swarm agents.During the Brood War, the United Earth Directorate Expeditionary Fleet took control of the Zerg unaligned with Sarah Kerrigan by controlling the second Overmind.The enslaved broods played a critical role in ensuring the UED's temporary dominance of the sector.