Not a real romantic reunion, of course (and thankfully) - but Addison and Derek are back together on Grey's Anatomy at least for one week, sparring over surgery.
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Derek and Richard do everything they can to save the life of this patient. That's what makes them the best.
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Mark and Addison used to have a thing. Now the only thing they are worried about is saving her brother's life.
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Addison and Derek used to be married. Now he's going to get engaged to Meredith, and all is well between the two of them.
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Callie Torres and Naomi Bennett (Sara Ramirez and Private Practice star Audra McDonald) on Grey's Anatomy in "Before and After."
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Another photo of Addison and Callie in church on Grey's Anatomy in the Season Five episode, "Before and After."
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Addison and Callie go to church on Grey's Anatomy, as seen in this photo from "Before and After."
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Derek Shepherd (Patrick Dempsey) wears a serious expression in the midst of Archer's dire situation.
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Grey's Anatomy Season 5 Episode 15 Quotes

Lexie: Wait, what's the prize?
Chief: You get to scrub in on Shepherd's craniotomy.
Lexie: Yeah!
Chief: And hold the doomsday sucker.
Lexie: What's the doomsday sucker?
Izzie: Doomsday sucker?
Chief: It's just a really big sucker.
Lexie: Yeah!

Every patient's story starts the same way. It starts with them being fine, it starts in the before. They cling to this moment, this memory of being fine, this before, as though talking about it may somehow bring it back. But what they don't realize is that they're talking about it to us, their doctors and that means there's no going back. By the time they see us, they're already in the after. And while every patient's story starts the same way, how the story ends depends on us, on how well we diagnose and treat. We know the story hinges on us and we all want to be the hero.

Meredith (narrating)