A sneak preview of "I Will Follow You Into the Dark" from the fifth season of Grey's Anatomy.
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Another scene from "An Honest Mistake," in which Izzie finds out that someone else may have a terrible illness, not the woman she misdiagnosed.
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A scene from "An Honest Mistake," in which Mark and Derek come to blows in front of everyone at Seattle Grace.
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Here's Ellen Pompeo on The Late Show with David Letterman, February 16, 2009.
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A final preview of "An Honest Mistake," which originally aired February 19, 2009 in the fifth season of Grey's Anatomy.
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A clip from "An Honest Mistake," the Grey's Anatomy episode that wraps up the crossover event.
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Another sneak preview of "An Honest Mistake," from the fifth season of Grey's Anatomy.
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A sneak preview of "An Honest Mistake."
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Grey's Anatomy Quotes

Just because we can live without something, it doesn't mean we have to.

Meredith

Derek: I am calling post-it, Zola, Bailey, the tumors on the wall, ferryboat scrub caps. I thought D.C. was everything. I was wrong. You... you're everything. I love you and I'm not going to stop loving you. I can't live without you. I don't want to live without you, and I'm going to do everything in my power to prove it.
Meredith: I can live without you, but I don't want to. I don't ever want to.