S4, E17: J.D.'s (Zach Braff) imagination is sparked by a patient, a sitcom writer, who is about to receive some very bad news. J.D. ponders how the lives of everyone at Sacred Heart, including his patient, would turn out if left in the hands of the writer. Elsewhere, Turk (Donald Faison) and Carla (Judy Reyes) are struggling to keep the romance in their relationship while Dr. Cox (John C. McGinley) and Dr. Kelso (Ken Jenkins) continue their one-upmanship over whose job is harder. Portions of this episode were shot in front of a live studio audience in the manner of a traditional sitcom. Clay Aiken guest stars as a talent show participant. Sarah Chalke also stars.