J.D. (Zach Braff) gets a surprise visit from his ne'er-do-well brother Dan (guest star Tom Cavanagh, NBC's Ed), and becomes jealous when he and Elliot (Sarah Chalke) hit it off. Meanwhile, Turk (Donald Faison) feels guilty after betting Dr. Cox (John C. McGinley) $20 that surgery would save a patient's life. Judy Reyes, Neil Flynn and Ken Jenkins also star
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