In February, "Grey's Anatomy" and "Private Practice" did their first extensive crossover storyline. The 3-episode arc started on "Grey's Anatomy" when Addison, Naomi Bennett (Audra McDonald) bring Archer Montgomery (Grant Show) to Seattle Grace to meet with Derek Shepherd (Patrick Dempsey), Mark Sloan (Eric Dane), Meredith Grey (Ellen Pompeo), and Richard to remove the parasites from Archer's brain. At first Derek says it's inoperable until Sam Bennett (Taye Diggs) later comes to Seattle and gives medical advice on how to remove the parasites. Derek and Meredith perform the operation successfully. The episode ends with Derek's patient Jen Harmon (Jennifer Westfeldt) having a complication from the brain surgery Derek performed on her shortly after Archer's surgery. The story continues on Private Practice where Sam has a sudden asthma attack and is treated by Naomi and Miranda Bailey (Chandra Wilson). Richard wants to publicize Archer's case. Mark convinces Sam that he had an asthma attack because of the stress of Archer being with Naomi who he still has feelings for. Addison assists Derek and Alex Karev (Justin Chambers) on Jen's case. The episode ends with Jen having another complication. The story concludes on "Grey's Anatomy". At this point, Naomi, Sam and Archer have returned to L.A. but Derek asks Addison to stay. Derek and Addison have an argument on their course of action for Jen and Jen dies in surgery.