S1, E12: A hyped Dr. Cox (John C. McGinley) challenges the hospital staff not to lose a single patient before his shift ends at midnight while J.D. (Zach Braff) is enchanted by an unseen female patient (guest star Elizabeth Bogush, "Titans") who is trapped inside an MRI machine -- and even considers asking her out. Elsewhere, Turk (Donald Faison) and Carla (Judy Reyes) grapple with a pained patient (guest star Michael McDonald) as they try to re-set his dislocated shoulder. Sarah Chalke and Ken Jenkins star.