Commander Prorok is a high ranking officer in Zarkon's military force. He once tried to capture Voltron alone, having little faith in Haggar's magic, but his attempt at glory only resulted in failure. He is later framed by Thace for treason and sabotage and transformed into a Robobeast. He was killed when Ulaz piloted his ship into the robeast's jaws and opened a space pocket within, causing them both to implode.