Every episode from the first five seasons of the long-running US medical drama set in Chicago's County General Hospital. It's always rush hour at the ER and each day brings new challenges, triumphs and losses. The series follows the private and professional lives of the hospital's doctors and nurses including Dr. Mark Greene (Anthony Edwards), Dr. Doug Ross (George Clooney), Dr. Susan Lewis (Sherry Stringfield), Dr. John Carter (Noah Wyle), Dr. Peter Benton (Eric La Salle) and Nurse Carol Hathaway (Julianna Margulies).