Geoff Stevenson

Elliot's wild sorority sister (Keri Russell) visits, making J.D. feel like a third wheel; Turk and Dr. Cox argue over the necessity of a patient-requested surgery; Carla discovers an unlikely ghost haunting the paediatrics area.

As the medics return for a seventh season, JD is contemplating his commitment to Kim, Elliot struggles with the idea of her upcoming marriage, and Carla tries to protect her diabetic husband from his sweet tooth.

The new interns are put to the ultimate test when they're asked to perform in the annual sketch show.

JD reminisces about his finest moments as a doctor, and Elliot is forced to confront her fear of children.

While Turk waits for Carla's answer, his visiting brother reveals news about his own marriage, Dr Kelso's colleague and friend has to face the end of his career, and Dr Cox and Jordan disagree over learning the sex of the baby.

Carla struggles to maintain her heritage while JD realises he uses nicknames because he knows no-one's real name.