A sneak peek at "I Will Follow You Into the Dark."
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A promo of "I Will Follow You Into the Dark" from the fifth season of Grey's Anatomy.
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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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Grey's Anatomy Quotes

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

Meredith

There's a reason I said I'd be happy alone. It wasn't 'cause I thought I'd be happy alone. It was because I thought if I loved someone and then it fell apart, I might not make it. It's easier to be alone, because what if you learn that you need love and you don't have it? What if you like it and lean on it? What if you shape your life around it and then it falls apart? Can you even survive that kind of pain? Losing love is like organ damage. It's like dying. The only difference is death ends. This? It could go on forever.

Meredith