Five Sneak Previews From "Before and After"

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Below are five sneak peeks from Thursday night's all-new episode of Grey's Anatomy, "Before and After." The big Grey's Anatomy-Private Practice crossover is in full effect, with Addison & Co. at Seattle Grace with her ailing brother, Archer (Grant Show).

From the clip below, his prognosis doesn't look good ...

[video url="" title="Before and After Preview #3"][/video]

Follow the jump for four more previews, in which Derek reunites with old friend Sam (Taye Diggs), Izzie gives the interns their daily assignment, Lexie pressuring Mark to go public with their relationship, and Sam and Mark poking fun at Bailey's new career path ...

[video url="" title="Before and After Preview #1"][/video]

[video url="" title="Before and After Preview #2"][/video]

[video url="" title="Before and After Preview #4"][/video]

[video url="" title="Before and After Preview #5"][/video]

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.

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Grey's Anatomy Quotes

MEREDITH: "You don't get to call me a whore. When I met you, I thought I had found the person that I was going to spend the rest of my life with. I was done! All the boys and all the bars and all the obvious daddy issues, who cares? I was done. You left me. You chose Addison. I'm all glued back together now. I make no apologies for how I chose to repair what you broke. You don't get to call me a whore."
DEREK: "This thing with us is finished. It's over."
MEREDITH: "Finally."
DEREK: "Yeah, it's done."
MEREDITH: "It is done."

CRISTINA: "There's a club. The Dead Dads Club. And you can't be in it until you're in it. You can try to understand, you can sympathize. But until you feel that loss... My dad died when I was nine. George, I'm really sorry you had to join the club."
GEORGE: "I... I don't know how to exist in a world where my dad doesn't."
CRISTINA: "Yeah, that never really changes."