 Following Sarah Kerrigan's transformation on Zerus, Stukov contacted her and told her about the experiments being performed on Skygeirr Platform.After defeating the shapeshifter, "Emil Narud", and his hybrids, Stukov joined the Swarm.Alexei Stukov was granted control of the "Stukov Brood"; a brood consisting strains of infestors, infested terrans and aberrations.