Izzie and ghost Denny share a passionate embrace.
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Izzie and Denny have it out on Grey's Anatomy. He vanishes, possibly for good, shortly thereafter.
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Derek and Cristina have a conversation in this photo from "Stairway to Heaven," from the fifth season of Grey's Anatomy.
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Cristina takes a moment to collect her thoughts in this photo from "Stairway to Heaven," from the fifth season of Grey's Anatomy.
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Callie Torres smiles ear-to-ear in "Stairway to Heaven," from Season 5 of Grey's Anatomy.
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Cristina shows her Stanford pride in "Stairway to Heaven," from Season 5 of Grey's Anatomy.
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A nice photo of Callie (Sara Ramirez) in "Stairway to Heaven," from Season 5 of Grey's Anatomy.
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Cristina presumably knows, but we'll have to wait to find out!
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Grey's Anatomy Season 5 Episode 13 Quotes

Derek: She's in the car, she's in the car and she won't stop crying.
Cristina: Did you propose?
Derek: No. She went to William's execution.

Meredith: I know you don't understand me. I don't understand me. I wanted to show him compassion. That's why I went. That's the reason. And it was horrible... it was horrible.
Derek: It's okay.