The residents are pushed to their limits when Owen puts them through a rigorous trauma certification drill; meanwhile, Cristina is also tested when left alone to monitor a very ill lung transplant patient.
Season 6 finale: A crisis hits Seattle Grace-Mercy West, testing Meredith and Cristina's surgical skills. Mandy Moore guest stars. The "Grey's Anatomy" season finale was almost enough for ABC to best CBS for an globaal, algemene win.