Since the first season, many characters have left the show or have been written out, and new main characters have been written in and out of the series.
After surviving the plane crash in the Season 8 finale, he begins Season 9 recovering from his injured hand.
His hand goes numb while he tries to grip one of the instruments before surgery. In season 10 Derek starts to work with the president, using his technology that he and Callie created.
An attending general surgeon at Seattle Grace hospital, Miranda Bailey initially gives a cold, domineering impression, earning her the nickname "The Nazi".
However, her attitude has since softened, and she has developed a maternal demeanor towards the residents in the hospital.
Richard has struggled with managing the finances of Seattle Grace Hospital and had eventually merged the hospital with Mercy West Hospital. Teddy marries a patient at the hospital named Henry so he can get insurance, but she eventually falls in love with him. He is the one who decides that Cristina should operate on Dr.