When J.D. and Turk are paid a visit by their college cohort, Spence -- who is now leading a life of luxury as an investment banker -- they are struck by the daily sacrifices they make as residents leading them to re-evaluate their career choices. Spence's visit also triggers the reveal of another dirty little secret - Dr. Cox learns the truth about his relationship to Jordan's baby, but the truth may be more than he can handle. Meanwhile, Elliot's skills and patience are tested by the unrelenting Dr. Kelso.