S3, E8: Elliot searches for the moment that will define her as a real doctor -- Tara Reid and Christa Miller Lawrence Guest Star. -- Turk (Donald Faison) joins J.D. (Zach Braff) in the winner's circle after he performs his first solo surgery brilliantly, leaving Elliot (Sarah Chalke) struggling to find her own defining moment. While the young residents wrestle with their professional challenges, Dr. Cox (John C. McGinley) deals with the reality of growing older when his back goes out and he refuses to admit that he needs help. Meanwhile, J.D. gains some insight into the life of the Janitor (Neil Flynn) that sheds new light on his intriguing history. Judy Reyes and Ken Jenkins also star.