With sirens wailing, an ambulance pulls into the bay. Doctors coping with too little sleep and too many patients rush to help, making split-second judgments that can mean the difference between life and death. Gurneys roll. Tensions rise. Medical miracles - or heartbreaks - unfold. And the final season of ER goes out as it came in 15 seasons before - with an electrifying mix of complex characters, rich storylines, brisk pacing and kinetic style. Favorite characters from the past (some you expect, some may surprise you) return in this 22-episode valedictory season of the series that shattered the mold for medical dramas. You've come to the right place. Check in one last, momentous time at County General.