The cast of Grey’s Anatomy (minus Isaiah Washington) went back to work this week on its fourth season. Joining the cast as Meredith Grey’s half-sister Lexi is Chyler Leigh. She plays a new intern at Seattle Grace. “Everyone is super gung-ho about the season,” she told People magazine. “At first I had that kind of new kid in school feeing, but everyone has been warm and welcoming with lots of hugs and pats on the back.” George (played by T.R. Knight) will also be back as an intern, after failing his exams.