I am doing this, because it's what you'd do for me, Mitchell.
— Carl to Mitchell after Mitchell has asked why Carl helps him to get off the blood
Carl and Mitchell were good friends. A long time ago rented a flat and lived there together. When Mitchell could not controll his bloodlust in 2000, Carl helped him to get off the blood. In 2010 Carl is in Bristol and accidently kills his boyfriend Dan as he bites him. Mitchell takes care of his friend Carl and helps him to escape from the police. Carl goes to Brasil.