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Tonight's two-hour Grey's Anatomy-Private Practice crossover event has its work cut out to live up to the amount of hype it's received - but we think it's up to the task.

In tonight's episode, "Before and After," Addison, Naomi and Sam rush to Seattle Grace to save Archer, and in the process, reunite with old friends Derek and Mark.

Meanwhile, in an attempt to figure out what's wrong with her, Izzie employs her fellow doctors in a medical game, and Owen Hunt runs into someone from his past.

Check out the videos and gallery we've posted for previews!

Derek and Naomi

As always, you can discuss "Before and After" before and after (ha!) the show in our

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Grey's Anatomy Quotes

Arizona: Oh my God! I mean, I understand why you're into her. She's hot. Wait, she likes you?
Nathan: What? I mean, I'm going to try not to be offended at that.
Arizona: No, no, no. It's just that Derek was--Derek was epic for her. They were the great love story. I mean, that girl's heart beat for Derek Shepherd. It just...it never occurred to me that she would ever be with anyone else. He was perfect. He was everything. That man turned her world. It...I spooked you. Don't be spooked.

Did you say it? 'I love you. I don't ever want to live without you. You changed my life.' Did you say it? Make a plan. Set a goal. Work toward it, but every now and then, look around; Drink it in 'cause this is it. It might all be gone tomorrow."

Meredith (closing voiceover)