Sophia Bush is getting ready to scrub in. The One Tree Hill and Chicago P.D. star will join Grey's Anatomy season 21 in a recurring role as Dr. Cass Beckman. The trauma surgeon is amiable ...

"One Tree Hill" and "Chicago P.D." star Sophia Bush is about to put on some scrubs. Bush has landed a recurring role on "Grey's Anatomy," joining the ABC medical drama's 21st season as Dr.