S7, E17: A young homeless man who is a former drug addict is found in a park showing signs of olfactory impairment and horrific scars and burn marks on his chest. With an uncertain identity and the patient’s severely worsening conditions, the team looks to the patient’s personal records and family history in order to understand his detachment. Meanwhile, Cuddy confides in Wilson and expresses her guilt for ending her relationship with House, and just as the team warms up to the patient, they discover a disturbing secret about the man whose life they saved.