J.D. is frustrated when his budding romance with an ex-patient wilts as their dates are constantly interrupted by emergency calls, while the beastly Dr. Kelso becomes less fearsome to the wide-eyed interns, when Dr. Cox informs them how to avoid the blowhard's bite. In addition, a perplexed Carla and Turk deal with their first sexual intimacy complication.

Alex and Elliot argue over missing medication, and J.D. needs to choose sides.

Meanwhile, Dr. Kelso gives Carla a ride to work and she sees a totally different side of him. Turk develops a conflict with Dr. Cox after he finds out that Dr. Cox has secret feelings for Carla.

Ben takes the news of his diagnosis pretty well - at least better than his sister Jordan and J.D. Remarkably, it is Dr. Cox who is the voice of reason and compassion, until his own fears get in the way.

Meanwhile, Turk and Elliot have their own issues to deal with. Turk is upset because he wasn't chosen to assist on a difficult surgery and Elliot is criticized during rounds by Dr. Kelso for the 100th time.

It's J.D.'s last day as an intern, and soon he will become a resident. Carla and Turk are arguing about dating other people. Elliot finally rebels against being everyone's doormat, and J.D. is just trying to stay out of people's way.

Jordan has returned to get a physical and a new patient, Mr. Bober, has been admitted, because he needs his gall bladder removed. He really needs the surgery, but doesn't have the insurance to pay for it. They enlist the help of Dr. Cox, Dr. Wen and Jordan.

When Dr. Kelso challenges the residents by offering a trip to a medical conference in Reno as a reward to the individual, who presents the most interesting case study, J.D. refuses to play along, earning him the respect of Dr. Cox.

In the meantime, Turk misses his opportunity to ask for a new laser on the one day of the year, that Dr. Kelso grants favors, so he is forced to find another way to come up with the goods.

J.D.'s brother is in town. Turk is thrown out of a patient's funeral for not knowing his name and feels even worse because earlier he made a bet with Dr. Cox over another patient's life.

Turk is still waiting for Carla to answer his proposal and asks his brother to stay over a few days to help him deal with it. Dr. Townshend, an old friend of Dr. Kelso and one of the nicest doctors around befriends J.D.

Elliot accidentally finds out the sex of Jordan's baby, becoming the object of Dr. Cox's anxiety.

Turk takes J.D. up to surgery, and right from the start J.D. steps all over Turk when trying not to be the geek among the surgeons. Paul hears Elliot say "I love U2" while she was rearranging her CDs and thinks she said "I love you too." Dr. Cox decides to get even with Dr. Kelso by telling everyone he's dead, revealing what people really think of him.

J.D. carries on with his romance with Jamie, but finds himself at a dead end after realizing she's a drama queen. Dr. Kelso makes Dr. Cox give a class on how to approach the patients nicely in order to prevent possible law suits. Carla's mother dies and she wants to get married.

J.D. is feeling left out of his friendship with Turk and gets hurt when Turk is scared of opening up to him.

Meanwhile, Carla is driven crazy over an unidentified urine sample, and Elliot tries to balance Sean and her career, so that one doesn't end up getting in the way of the other.

Finding difficulties training his interns, J.D. asks to Elliot for some help. She tells J.D. about Sean, who gave Elliot great tips based on his dolphin training that fit perfectly for her interns.

Dr. Cox finds the ideal pediatrician for his son: Dr. Norris, who acts and looks just like him. However, Dr. Cox is quick to find a problem with him once Jack develops a cough that scares both him and Jordan.

Sean is a bit surprised and disturbed to learn about Elliot and J.D.'s history together, but it turns out his anger is really a cover up for his upcoming six month long trip and he doesn't want Elliot to explode.

Dr. Cox. is forced to swallow his pride and actually ask for help when he decides to throw his hat in the ring for the Residency Director position at the hospital.

Carla picks up an extra shift as a surgical nurse, which allows her to spend the day working alongside with Turk, to his great annoyance.

J.D. believes he may have finally found a mentor in Dr. Kevin Casey, a surgeon with obsessive-compulsive disorder, and it turns out that Dr. Cox has always been jealous of the guy.

Meanwhile, the Janitor and his new assistant help Kelso out with a garbage problem.

J.D. tries to impress Kylie by paying a hobo in the hospital to fake a heart attack, when everything becomes boring due to a quarantine that he caused.

Turk learns, that Carla dated Cox and gets mad at her for not telling him.

The Janitor makes a bet with Dr. Kelso, who is starving, that will make him pay $700, unless the Janitor is able to get a "face cake," in order to satisfy him, from Laverne.

Also, Danni Sullivan returns to annoy everyone, causing a constant fight between Ted and Doug.

While planning his birthday, J.D. finds a list of things he wanted to accomplish, before he turned 30. He enters a triathlon to begin. Meanwhile, Elliot discovers a side of her boyfriend Jake, that freaks her out. And Turk is working hard to impress his bosses and takes on a patient, who wants to be hypnotized during surgery in effort to be promoted.

Turk finds out, that Carla is pregnant, before she does, so J.D. convinces Turk to tell the entire hospital staff to surprise Carla with the news. But Carla wants to personally share her baby news with everybody, so Turk and J.D. have to quickly contain the hospital gossip. Meanwhile, when Elliot puts Dr. Cox into an embarrassing situation, he decides to get even with Elliot through Keith and Carla.

Dr. Kelso's beautiful but unethical replacement, Dr. Maddox, shakes things up at Sacred Heart, while J.D. struggles to manage a new crop of incompetent interns and Carla helps Elliott put her ego in check.

Dr. Kelso and Dr. Cox have to work together again to get rid of Dr. Maddox, while Carla faces an incompetent intern.

J.D., Turk, Cox, Kelso and intern Denise return to Sacred Heart to teach med school, while new med students Lucy, Drew, Cole and Maya are put through the ringer on their first day of school.

J.D. still clamors for Dr. Turk's approval as he approaches his final day of teaching at Sacred Heart, Lucy searches within herself for the courage to perform a basic medical procedure on a real human, and Denise and Drew make things official.

A case of guilty conscience plagues the med school when a student cheats on an exam and Dr. Cox takes it out on the entire class. Meanwhile, Denise makes a startling admission of her own.