The worlds of Grey's Anatomy and Private Practice collided in an epic, two-hour episode last night in which Addison, Naomi, Sam and Archer arrived at Seattle Grace, where their old friend Derek was charged with saving his life.

In addition to one of the most suspenseful surgery scenes in recent memory, we learned a lot about our favorite characters - both past and present - in this crossover event.

And it's far from over.

Due to the unique circumstances of the shows we love merging on the same night, we've recapped the events of Grey's and Private Practice together.

Follow the link for a recap of "Ex-Life" ...

Addison (Kate Walsh) was back on her old turf last night.

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.