The ER treats victims of a gang shootout.  Carter arrives late and unprepared for his new position.  Mark learns all about being an attending, including senior staff's habit of bad-mouthing the residents, particularly Doug Ross.  Mark hires a new chief resident, Kerry Weaver.  New third year med students arrive to complete their ER rotation.
               
              
                Casts: 
                Parminder Nagra, Linda Cardellini, David Lyons, Angela Bassett, Maura Tierney, John Stamos, Scott Grimes