A chance meeting in the elevator sparks a new friendship between J.D. and the mysterious Danni whose ongoing dialogue about her ex forces J.D. to talk about his feelings for Elliot.

Carla's brother Marco comes to visit, but he still hasn't forgiven Turk for mistaking him for a valet at their mother's funeral. Unfortunately, Turk can't even apologize because Marco can't speak anything but Spanish.

At the hospital, Dr. Cox relishes his new job promotion but is surprised when J.D. doesn't follow his lead in contradicting Dr. Kelso's orders.

As J.D.'s relationship with Danni progresses, he and Dr. Cox are forced to spend more time together outside of the hospital, to Perry's great chagrin.

Meanwhile, as they each deal with problems in their own relationships, Carla and Elliot work to find their own balance between their personal and professional relationships.

Dr. Kelso accidentally punctures his eardrums giving the hospital staff an opportunity to tell him how they truly feel about him.

Elliot struggles to find her defining moment after Turk performs his first solo surgery. Dr. Cox deals with the reality of growing older when his back goes out. J.D. finds out that many of the hospital staff don't know the Janitor as he does.

Carla and Elliot try to help a patient, Maggie, lose her virginity as she prepares to die.

Walking in on her sister and Dr. Cox prompts Danni to move in with J.D. Dr. Cox attempts to convince Turk to do a kidney transplant for a patient he has "moved up" the list. But a personal grudge seems to stand in the way and may decide whether the patient lives or dies.

J.D. tries to break-up with Danni, but she beats him to it when she realizes that she will always be second place to Elliot in his heart.

Dr. Cox suddenly becomes a nice guy and Elliot changes back to her old self after Dr. Kelso criticizes her new look.

Jordan's brother and sister return, but Dr. Cox learns that his brother-in-law Ben hasn't visited a doctor about his cancer in the two years he has been gone traveling the world.

J.D. hooks up with Danni again, after Sean returns, but he can't forget about his passionate night with Elliot.

Meanwhile, Dr. Cox realizes, that he might actually have a crush on the one doctor he loathes.

Elliot asks Sean to move in with her, which only adds to J.D.'s problems.

Turk is unsure why Dr. Miller's attitude towards him has changed, until he finds out that Carla un-invited her from their wedding.

Dr. Kelso outrages Dr. Cox when he announces that Sacred Heart will begin doing full body scans, starting with an ever present hypochondriac patient, who wants any freebies he can get.

J.D. is unsure what to do, when he realizes he made a mistake telling Elliot he loved her.

The Janitor squares off against Dr. Cox after he loses the election of the janitors to Randall.

Carla's brother Marc constantly puts Turk in a tough situation, when Turk forgets to write his wedding vows.

The big day for Turk and Carla has finally arrived, but a patient holds up Turk.

With Elliot still angry at him, J.D. attempts to reconcile her with Sean as a way to make everything right again in their friendship.

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.