An image from the episode "Haunt You Every Day."
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... Mouse? George meets a woman dressed in costume. Hey, it's Halloween and anything goes.
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Lexie Grey is a cutie, even wearing pigtails and yellow scrubs. We look forward to seeing more and more of this character.
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Cristina leans back and looks on with her usual expression of disinterest. But we all know the mind of Dr. Yang is complex, to say the least.
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Ava / Jane Doe / Rebecca Pope won the heart of Alex Karev last season... now she's back. Will he make the same error and let her slip away again?
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Call her Ava, call her Jane Doe, call her Rebecca Pope. Call her what you want... Alex loves her, and she's back!
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George and Izzie. Their status continues to confound and cause great debate among Grey's Anatomy fans. Where will this love triangle (with these two and Callie Torres) lead?
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You don't see George too happy these days, so this photo of him smiling at Izzie comes as a rare sight. Will it last?
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Richard talks with George and Lexie about a patient. The Chief is always a steady, strong presence at the hospital.
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Izzie and George may very well be in love... but it does not look like they will last. Or does it? The writers have kept us guessing to this point.
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Alex and Izzie talk with a patient. These two had some tense moments in the previous episode. Hopefully all is well.
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Lexie talks to a mouse... or a human dressed as one for Halloween. It may also be another animal... we can't really tell!
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Grey's Anatomy Season 4 Episode 5 Quotes

Richard: Dr. Yang, did you hear? Dr. Hahn has agreed to become our new head of cardio-thorasic surgery.
Cristina: You can't have my apartment.

Mark: Good morning.
Olivia: Don’t. Don’t do that. Don’t smile at me.
Other Nurse: Don’t smile at her. Don’t smile at me either.
Olivia: We’re on to you.
Other Nurse: We’ve compared notes.
Mark: Compared notes? Really?
Olivia: Compared notes. Compared pick-up lines. Compared techniques.
Mark: Techniques...
Olivia and Other Nurse: Identical.
Mark: Identical?
Olivia: We formed a club. Nurses United Against Mark Sloan.
Mark: Are there any club activities?