Tom Cavanagh returns yet again as J.D.'s brother, Dan, on Scrubs.
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In a flashback to an old frat party at college, J.D. wears black face paint while Turk wears white.
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Turk does his best to deny Carla wine when he discovers she's pregnant before she does.
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The beautiful Maria Menounos guest stars on Scrubs as Tamara, a girl only interested in J.D. for his hair.
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After being unable to conceive, Carla, already on fertility medicine herself, questions Turk's fertility.
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Dave Foley guest stars as Dr. Hedrick on Scrubs as he annoys a grieving Cox and J.D.
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The hospital says goodbye to one of their favorite patients, Mrs. Wilk.
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Elliot choose Keith, J.D.'s intern and nemesis, has her partner for bootycalls.
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All of Sacred Heart crushes on the new gynecologist, Dr. Matthews, played by Jay Kenneth Johnson.
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Mandy Moore begins her multi-episode arc as Julie Quinn, a love interest for J.D. on Scrubs.
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Jason Bateman guest stars as a crazy patient, Mr. Sutton on Scrubs.
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Elliot tries to convince people she's an expert in endocrinology after her brief fellowship.
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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?"