what episode does derek's wife show up
Addison Montgomery The character Addison first appears in the season one finale of Grey's Anatomy, arriving at Richard's behest. She tries to reconcile with Derek, despite his relationship with Meredith Grey, but he is still angry with her, and there is a period of antagonism between them. Addison's presence, however, does reinvigorate their relationship, and ultimately leads to Derek choosing Addison over Meredith, despite Derek eventually admitting that he fell in love with Meredith.[13] They attempt to return to their former life, taking residence in his trailer, and Addison becomes the head of a unique surgical service integrating neonatal surgery and obstetrics and gynecology.[14] She realizes that Derek still has feelings for Meredith, and their marriage is tested further when Mark arrives in Seattle looking for Addison. Mark makes Addison realize that Derek is in love with Meredith and that he (Mark) does love her.[15] Derek sleeps with Addison after he sees that Meredith has moved on. When Addison finds out that Derek had sex with Meredith, she gets drunk and sleeps with Mark. He asks for a relationship, but she rejects him.[16]