Alongside Leave, Lang is an Evoluder soldier who came to Earth to find Orgun, however, Lang's main intention was to destroy Orgun.

Lang is a "Head Evoluder", making him Orgun's superior in terms of rank. He is a cold-hearted machine, who will not hesitate in eliminating his target.

Lang is finally able to fight Orgun, but he is destroyed by Leave in an attack which ends up killing herself in the process.