Grey’s Anatomy TV Series: The Complete Sixth Season. Expect more competition, more doctors, and much more drama as Seattle Grace merges with a competing hospital in Grey’s Anatomy’s celebrated Sixth Season. Relive every moment in this sensational 6-disc set. Meredith, Derek, Izzie, and the rest of your favorite characters face a brand new challenge with the arrival of doctors from Mercy West. Battle lines are drawn and rivalries reach new heights in an unforgettable year at Seattle Grace.