A camera crew shooting footage for a documentary interviews members of the ER staff. Detective Claudia Diaz is brought in, critically injured withballoonshot wounds. Neela laments the lack of communication between her and Brenner. Sam struggles to reconcile with her mother. Carter's condition worsens quite suddenly.
Season 15 Episode 18 of ER resulted in a 0.00 rating in the 18-49 demographic.
        s15e01 - Life After Death
          
        
      
    
        s15e02 - Another Thursday at County
          
        
      
    
        s15e03 - The Book of Abby
          
        
      
    
        s15e04 - Parental Guidance
          
        
      
    
        s15e05 - Haunted
          
        
      
    
        s15e06 - Oh, Brother!
          
        
      
    
        s15e07 - Heal Thyself
          
        
      
    
        s15e08 - Age of Innocence
          
        
      
    
        s15e09 - Let It Snow
          
        
      
    
        s15e10 - The High Holiday
          
        
      
    
        s15e11 - Separation Anxiety
          
        
      
    
        s15e12 - Dream Runner 
          
        
      
    
        s15e13 - Love Is a Battlefield  
          
        
      
    
        s15e14 - A Long, Strange Trip 
          
        
      
    
        s15e15 - The Family Man 
          
        
      
    
        s15e16 - The Beginning of the End
          
        
      
    
        s15e17 - T Minus 6
          
        
      
    
        s15e18 - What We Do
          
        
      
    
        s15e19 - Old Times
          
        
      
    
        s15e20 - Shifting Equilibrium
          
        
      
    
        s15e21 - I Feel Good
          
        
      
    
        s15e22 - And In the End
          
        
      
    ER follows the medical personnel and patients in the emergency room of Chicago's fictional County General Hospital. 
As the doctors and nurses of County's ER confront the daily challenges of a busy urban hospital, including overcrowded waiting rooms, staffing shortages, and the impact of life-and-passing decisions. While they teach the next generation of doctors, the each must tackle demands of their personal lives, at times unsuccessfully. 
The staff is led by Chief of Emergency Medicine Dr. Luka Kovac, a gifted teacher who came to Chicago from Croatia following the tragic passing of his wife and children, but now finds his life on an upswing, and Dr. Kerry Weaver, County's Chief of Staff, a compassionate doctor and uncompromising administrator whose rigid style has isolated her from the medical staff. The ER is staffed by fourth-year resident Dr. Gregory Pratt, who puts patients before procedure, yet fears the responsibility now thrust upon him, feisty nurse Samantha Taggart a tough single mother attempting to balance her difficult personal issues with her demanding professional life, and Scott Grimes as the less than capable Chief Resident Dr. Archie Morris, along with a trio of second year residents: Dr. Abby Lockhart a former ER nurse turned doctor, building a new career and a new life that has taken a sudden and unexpected turn, Dr. Neela Rasgotra recently married and finding her role in the ER after a long period of uncertainty, and Dr. Ray Barnett who must make the choice between his career as a doctor and the rock band in which he plays. Featured this season as recurring characters are John Leguizamo as the innovative, and problematic, Dr. Victor Clemente, Kristen Johnston as demanding Nurse Manager Eve Peyton, and Leland Orser as the ER's highly individual surgical attending, Dr. Lucien Dubenko.