Natalie Morales will officially join the cast of 'Grey's Anatomy' for Season 21, reprising her role as Dr. Monica Beltran. She is confirmed to appear in at least six episodes, starting with the second episode of the season, with the possibility for more. In the previous season, her character navigated a messy divorce while mentoring Dr. Levi Schmitt, and sparked a potential love triangle with characters Winston and Amelia. Ellen Pompeo will also return as Meredith Grey for at least seven episodes, alongside other familiar faces from the series. The new season, which promises intriguing plot developments, will premiere on September 26 on ABC.