"Grey's Anatomy" and "Private Practice" did their last crossover before the series finale in 2013. On "Grey's Anatomy", Amelia returns to Seattle to convince Derek and Lexie Grey (Chyler Leigh) to operate on Erica Warner (A.J. Langer) who has a gliosarcoma. Lexie helps Amelia practice and Derek eventually agrees to help as well. Then on "Private Practice", Cooper Freedman (Paul Adelstein) and Charlotte King (KaDee Strickland) bring Erica to Seattle Grace to meet with Derek, Lexie and Amelia about the operation. Erica's surgery is successful.