Nathan becomes so paranoid for Shilo's safety that he tells her that she inherited a blood disease that had killed her mother, and that she must stay home her whole life. He makes a deal with Nathan that he will let him out of jail to raise Shilo if he worked for him as a Repo Man. After Marni died, Nathan had managed to save Shilo's life, but was arrested by Rotti for 'killing' her.

However, unbeknownst to him, Rotti had poisoned his medicine, which in turn killed Marni. Nathan created a medicine that he hoped would cure her. While Marni was pregnant with Shilo, she became severely ill. Marni became pregnant with her first child, whom she named Shilo. She felt love for him in return and left Rotti at the altar to marry him. Nathan was a surgeon who had been in love with Rotti Largo's fiancée, Marni. He was portrayed by Anthony Stewart Head.

He is a Repo man who works for GeneCo to repossess organs that cannot be paid by their clients. Nathan Wallace, also known as the ' Repo Man', is the deuteragonist of Repo the Genetic Opera. But there is something I can't tell her, I am lost without you here, I am only living out a lie! I raised our Shilo with the best intentions.

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