Danni's (Tara Reid) ongoing dialogue about her ex forces J.D. to talk about his feelings for Elliot; Carla's brother (Freddy Rodriguez) comes to visit.
J.D.'s brother (Tom Cavanagh) is dismayed by how cynical his little brother has become; Elliot and Carla begin moonlighting at a veterinary clinic.
J.D. is forced to spend more time with Dr. Cox as his relationship with Danni (Tara Reid) progresses; Dr. Kelso punctures his eardrums, giving staffers an opportunity to tell him how they really feel about him.