Turk saves a man's life at the taco stand, but Cox taks the credit; Elliot enlists J.D.'s help to prevent her dates with Jake from becoming too intimate; Kelso terrorizes the hospital from his motorized wheelchair.
Jake (Josh Randall) brings in his dying neighbor and helps convince her it's time to die, but gets sued by her brother; Elliot goes to Cox and Carla for romantic advice with Jake; Turk has problems in couples therapy.
Molly returns to Sacred Heart and J.D. blows off Kylie to go out with her; Carla finds out Turk is still in contact with his ex-girlfriend; The Janitor bets Cox his van for Cox's porsche he can get a date with Elliot.
J.D. and Cox have to deal with a manipulative malpractice lawyer, Neena Broderick (Julianna Margulies); Turk tries to avoid a hypochondriac patient Harvery (Richard Kind); Elliot steers Doug on a new path.
Dan (Tom Cavanagh) comes to visit J.D. to tell him their father died; Cox has problems helping J.D. cope; Turk has symptoms of diabetes but refuses to go to a doctor and Molly uses psychology to convince him.
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.
Dan: Hey, mind if I join you guys? Dr. Cox: I think the question you should be asking is, "Mind if I diddle your ex?" Oh, and just a great big congratulations on your on-going streak of being the world's worst older brother! Dan: Thanks, Coxy!