Grey’s Anatomy has cast a new star for season 21. The series is a long-running medical series that began airing in 2005, and has since had 20 completed seasons. Grey’s Anatomy season 21 began last month and is currently airing episodes weekly on Thursdays. The series features a leadig cast including Ellen Pompeo, Chandra Wilson, James Pickens Jr., Justin Chambers, Kevin McKidd, Jesse Williams, Camilla Luddington, and Patrick Dempsey.