 It was Kate Walsh's (Addison Montgomery) last episode with regular billing who became a main character in "Grey's Anatomy" spin-off "Private Practice" and Chyler Leigh (Dr. Lexie Grey)'s last appearance with recurring billing as she would be upgraded to a series regular in season four.The episode opens to a voice-over narrative from Richard Webber (James Pickens, Jr.).Addison gets to the ER with the woman from the bar, the previous episode.