Callie and Erica fight over Izzie, and Erica leaves - presumably for good.
Added:
Cristina and Alex get a tongue-lashing from Hunt over their treatment of a patient, but then Cristina opens up to Owen.
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The residents meet a new "patient" - and learn an important piece of news.
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Cristina and Owen get into it over the big surgery.
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The Chief announces to the residents that a solo surgery will be awarded, and the news sends them into a competitive frenzy.
Added:
A promo for "Rise Up" from the fifth season of Grey's Anatomy.
Added:

Grey's Anatomy Season 5 Episode 7 Quotes

George: We're operating on robots now?
Alex: Can we please go back to pigs.
Cristina: Yeah, what about people?
Miranda: Well when the Chief decides which one of you gets to do the first solo surgery, you'll wanna be ready.

I do not know what it will be, I do not know when it will be. I do know that the winner should be prepared to do any surgical procedure and will choose one intern to scrub in. So practice your skills, impress your attendings, and do not make me look stupid.

Miranda