In the first episode of a two-part story, Addison (Kate Walsh) heads to LA for a reunion old medical-school friends, blissfully unprepared for what it is in store for her. Meredith's stepmom Susan (Mare Winningham) is brought in with a truly bad case of hiccups, just as Meredith (Ellen Pompeo) thinks she has come to terms with their relationship. "Jane Doe" (Elizabeth Reaser) has been identified as "Ava", and Alex (Justin Chambers) is happy with her by any name. And Cristina (Sandra Oh) prepares for her wedding with the dubious input of her own mother (Tsai Chin) and Burke's mom (Diahann Carroll). This episode serves to introduce the future costars of the Grey's Anatomy spinoff Private Practice: Tim Daly (Pete), Amy Brennerman (Violet), Taye Diggs (Sam), Chris Lowell (Dell) and Paul Adelstein (Cooper) (the character of Naomi, here played by Merrin Dungey, would be taken over by Audra McDonald in Private Practice). ~ Hal Erickson, Rovi