Season 4

Turk and Carla start to have issues when Carla tries to change everything about her new husband. Molly Clock (Heather Graham), the hospital's new psychiatrist, becomes friends with Elliot because she believes Turk, J.D. and Carla are shutting her out. Also, when Turk and J.D.'s car blows up, Carla lets him pick out the new ride only to find that instead of a car, he buys three scooters for them, further proving Carla's point that she needs to always be in control. The episode guest stars the Sugarhill Gang.

Dr. Clock tries to reconcile J.D. and Eliot, while waiting to see which one Dr. Cox will give the Chief Resident position to. Molly and Carla are experiencing some subtle conflict and Elliot and J.D. begin to come together after long bouts of conflict of their own. Meanwhile, Dr. Cox, Turk and the Janitor are forced to work together to help a patient.

Dr. Cox is having issues with Jordan, since Ted revealed that they are still technically married due to some filing problems. J.D. has problems of his own as he can't shake off the tag of Co-Chief Resident the Janitor assigned to him, while Elliot keeps the Chief Resident tag. Elsewhere, Turk begins to doubt his abilities after letting a patient die and isn't helped, when he finds out J.D. has no confidence in him either. Dr. Cox and Molly spar about her involvement in his patients.

J.D. is shocked to hear Dr. Cox tell his interns that eventually, they will screw up and kill a patient. J.D. fears his first time killing someone will soon be upon him. Elliot is upset with Molly, after she disagrees about a patient's promise to attend drug rehab. Carla loses Rowdy and she and the Janitor go looking for him.

Elliot becomes unsure, if she wants Molly as her mentor, when she finds out that Molly doesn't have a perfect home life. J.D. is tested in leadership skills when Dr. Cox yells at him in front of his interns. Carla and Turk try to come to an agreement when Turk continuously wakes Carla up every night.

When Dan resurfaces, J.D. is shocked to learn his father has passed away. The reactions from his co-workers help J.D. a little, but the one person, Dr. Cox, who he wanted to be there for him is too busy with J.D.'s patients. Meanwhile, Dan sits drunk in the bath tub the whole day and Turk finds out he has Type II Diabetes.

When J.D. finds Dan with Elliot, Turk tells him to use the hurt brother excuse to get them to break up, just like Turk uses his diabetes to get stuff from Carla. But then J.D. realizes he wasn't hurt at all... Dr. Cox and Dr. Kelso unite to try and torment their common enemy: Dr. Clock.

When Molly takes a job at a different city, she and J.D. end up having a night of kissing, and he tries to rush to sleep with her before she leaves. Dr. Cox goes on ambulance duty with a maniac, who he eventually finds out is a woman who has lost her son to an accident.

J.D. is approached by a malpractice attorney, asking him to do a risky procedure on her father. Meanwhile, Elliot guides Doug to a new career path and Turk struggles to avoid a hypochondriac patient.

With the case against Turk on his mind, J.D. attempts to end it with Neena, but she won't take "no" for an answer and keeps him wrapped around her finger. Carla tries her own way of persuading Mr. Corman to drop the lawsuit. Elliot sets out to prove she isn't the doctor she was four years ago and doesn't need to rely on anyone anymore.