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Turk and Carla begin to have issues as she attempts to change her new husband; Molly (Heather Graham), a new psychiatrist becomes friends with Elliot; Carla lets Turk pick out a new car but instead he buys three scooters.
On the day of Turk and Carla's wedding, Turk is delayed in surgery and the wedding ends up being canceled, but the reception goes on. Danni gets drunk and wreaks havoc. J.D. tries to convince Sean to take Elliot back.
Marco helps Turk write his own wedding vows; J.D. resigns himself to a relationship with Elliot despite not loving her; when Jordan insists she and Cox stop fighting, he antagonizes the Janitor. Moved by Turk's vows, J.D. admits to Elliot he doesn't love her.
J.D. and Danni break up while Sean and Elliot plan to move in together; Carla gets anxious over last minute wedding plans; Dr. Cox bets Kelso that no healthy pastient will sign up for a full body CAT scan.
J.D. attempts to make Elliot jealous by getting back with Danni (Tara Reid); Dr. Cox realizes he has a crush on Dr. Miller; Turk and Carla encourage the Janitor to take a promotion to security guard; Sean confronts J.D. about what happened with Elliot.
In this episode narrated by Turk, he delays mailing out the wedding invitations; J.D. covers Elliot's stint as a clown; Turk makes a mistake during surgery causing nerve damage to a young pianist.
Carla has dinner with an old crush and asks J.D. not to say anything; Elliot's patient, Mr. Thompson (Alexander Chaplin), refuses to take drugs, but Cox tries to convince her that Thompson is a drug addict.
A butterfly, symbolizing the butterfly effect, prompts the question on what could have happened different as Turk looks for his lucky do-rag for surgery and Elliot tries to find a lost stuffed animal for a child needing a bone marrow transplant.
J.D. attempts to comfort Cox after Ben's death, while Jordan's friends, Maddie (Embeth Davidtz) and Allison (Julie Warner), stay with her to comfort her.
Jordan's siblings, Danni (Tara Reid) and Ben (Brendan Fraser) come to visit for Jack's first birthday; Carla agrees to take Turk's last name only if he has his mole removed; Dr. Cox is angry to find out Ben has not been to a doctor for a followup since his remission.