The Omegabrain (オメガブレイン, Omegaburein) is an even larger and more destructive version of the original ultrabrain unit which invaded earth a few decades ago. The omegabrain houses the Alien Empress (エイリアン皇后, Eirian Kogo), who is the true leader of the mysterious race of terrible and unmerciful alien creatures which have set their sights on planet earth to conquer,for whatever reason.