When J.D. is bothered by Elliot and Dan's romantic involvement, Turk encourages him to use the hurt brother excuse to break em up.
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Dan (Tom Cavanagh), J.D.'s brother returns with some depressing news: their father died.
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Molly and Elliot argue on how to handle an ex-drug addict patient of Elliot's.
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Turk and J.D. come up witha new name "Gravelling" where they put themselves in other peoples' shoes.
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Turk and Dr. Cox are stumped on how to remove a light bulb from a patient's bum.
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Heather Graham debuted on Scrubs during season four as Molly, the hospital's new psychiatrist.
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Things don't go as planned at Turk and Carla's wedding and they end up at the hospital, where they actually get legally married.
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A picture of the happy couple, Carla and Turk at their practice ceremony.
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J.D. is happy to steal Elliot away from Sean, but how long will that feeling last?
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Dr. Kelso learns why you do not take the emergency exit out of the hospital.
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In a story narrated by Turk, he ends up making a mistake during surgery that costs a young concert pianist his career. High five!
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J.D. must keep a secret when he learns that Carla goes for dinner with a what-if guy.
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Scrubs Quotes

J.D. [to Cox]: you won't admit this, but you're in love with Carla.
Carla: No, he's not.
Dr. Cox: Actually, I am.
Carla: You're starting again.
J.D.: And Carla, you're mad that Turk didn't trust you enough to tell you.
Turk: See? Trust, woman, trust!
J.D.: Whatever. The point is that Turk is sorry.
Turk: Not anymore!
Carla: I can't believe you thought he was a threat.
Dr. Cox: I'm a threat!
Carla: You're not in love with me, you idealize me.
J.D.: Can we just try and stay focused...
Turk: You're mad 'cause I'm scared of losing you?
Carla: Yes, because we're stronger than that!
Dr. Cox: Apparently not!

J.D.: My man Turk, is getting it daily and nightly and ever so rightly! Ah! What up, dogg!
J.D.'s narration: Once every 4.2 seconds a man says something stupid that a woman hears and punishes him for... luckily, this wasn't one of those times.
Carla: What did you just say?
J.D.: "What up...dogg?"