House and Park treat a patient, Benjamin Byrd, who collapsed suddenly after making a surprisingly large charity donation. When the patient offers to donate an organ to another patient, the doctors must convince Dr. Adams to help them confirm whether Benjamin is in his right mind or not. They are convinced his extreme altruistic behavior is a symptom of a deeper medical disorder. Feelings of guilt hamper thirteen's pursuit of happiness.
Spoilers ahead. Coverage follows the scope labeled below.
Complete story — includes the ending
When a man ( Wentworth Miller ) collapses after making a million dollar donation, Dr. Park believes his extreme altruism may indicate a neurological disorder, while House sees a way to fund the rebuilding of his old team back together. Meanwhile, Dr. Adams volunteers her services to the department while looking for a new career, and Thirteen ( Olivia Wilde ) returns to House only to say goodbye again. Final diagnosis: Plummer's disease Absent: Jesse Spencer as Robert Chase and Peter Jacobson as Chris Taub.