ER explores the inner workings of an urban teaching hospital and the critical issues faced by the dedicated physicians and staff of its overburdened emergency room.
After the ambulance explosion, Dr. Pratt fights for his life and the entire ER team rallies around him.
Dr. Banfield's arrival and tough attitude causes the whole ER staff to feel defensive. Gates and the new interns fight to save the life of a terrorist while risking their own lives.
On Abby's first day as an attending and her last day at County, she faces off with Banfield over the care of a gunshot victim, teaches Frank to tango, and defends Sam before the disciplinary board.
Banfield gets mugged, Sarah gets a tongue stud, the interns are paired with mentors, and an abusive sibling is found out.
On Halloween, doctors treat a student who's injured in a cafeteria fight while trying to defend his dysfunctional mother.
Banfield is upset when her husband Russell insists on a visit with his parents; Morris favors Chaz over senior interns, resulting in trouble; Gates asks Sam and Alex to move in with him.
While trying to save a little girl who fell into icy Lake Michigan, Banfield relives the death of her five-year-old son, who was attended at County by Dr. Mark Greene.
When an accused pedophile winds up in the ER, Brenner relives his painful past.
While snow strands Banfield and Morris in Omaha, Sam's son Alex is gravely injured in a fatal car crash.
At Christmas time in the ER, Sam's son Alex is still on a ventilator, and immigration waits to deport a new mother who's just undergone a complicated delivery.
A drug deal gone wrong brings four gunshot victims into the ER; Banfield investigates her fertility; Sam and Gates deal with the results of their break-up.
Neela dreams the same day several times over; which ultimately leads to the saving of two patients, an interview with Corday, a job offer at County, and an afternoon delight.
Morris tries to help a young accident victim, and a couple that have been married and divorced three times over 50 years visit the ER. Garry Marshall guest stars.
An elderly patient with dementia is revealed to be an early progenitor of the ER -- how times have changed! William H. Macy guest stars.
A car accident in the ambulance bay leaves a woman with a young child severely injured and in need of immediate surgery. Brenner has difficulty finding a family member to care for the daughter. Morris treats an elderly patient in need of an MRI and gets the run around from an insurance company. Neela tells Brenner about her job offer from North Carolina.
On a busy Valentine's Day, Dr. John Carter returns to the ER, hoping to pick up a few shifts. Noah Wylie, David Eigenberg and Wallace Shawn guest star.
Carter's skills are called into question on his first day back in the ER; Brenner's old wounds resurface; Sam struggles when her estranged mother doesn't recognize her. Amy Madigan and Judy Greer guest star.
A documentary film crew records the day when Claudia gets shot and Carter falls down on the job while trying to care for her.
Dr. Ross and Nurse Hathaway at a Seattle hospital work with a patient's grandmother to get permission for them to harvest her grandson's organs to help save lives, one of whom is Dr. Carter.
On her last day in the ER, Neela agonizes over her fear of making mistakes.
The ER staff spends the day volunteering at Camp Del Corazon, a program for kids who've had open heart surgery. Tom Arnold guest stars.
In the series finale, Dr. Carter opens a new medical facility for the underprivileged in Chicago and some old friends from County General all come to show their support.