Helm here is veteran of Third World War. He served as a juggernaut, the heavily armored infatry unit. When the war was over he got diagnosed to suffer from PTSD (Post Traumatic Stress Disorder). Few years later someone hibernated and frozen just for someone to unfreeze him just to let him spread havoc under an influence of his mental disorder.

Dr. Albrecht Stefan is a mad scientist known from his own army of robots and genetically modified animals. This time he somehow went from his times to future (StarCraft times) and it seems he began new experiments. Whether on Arcturus's side or not.