ER

Abby wakes up after the ambulance explosion and, though she realizes she has a broken wrist, quickly rushes to check on the others in the ambulance. A mother and daughter are also rushed in from the explosion and Abby misdiagnoses the case. Meanwhile, Morris and Neela struggle to keep up with the injuries sustained from the explosion.

It's just another day in paradise, as Dr. Catherine Banfield's (new series star ANGELA BASSETT) arrival and tough attitude causes the whole ER staff to feel defensive. Gates (series star JOHN STAMOS) and the new interns fight to save the life of a terrorist while risking their own lives. Neela finds an unlikely advocate in her fight to get Dr. Dubenko (series regular LELAND ORSER) back on the surgery staff.

Neela is disappointed when she finds out Abbys good news secondhand. When a gunshot wound victim comes into the ER, the new chief, Catherine Banfield, and Abby butt heads on how to treat the patient. Abby comes to Sams (series star LINDA CARDELLINI) defense when she goes before a nurses disciplinary board.

After Banfield defends herself from a street criminal, she and Dr. Gates treat a young gymnast with suspicious injuries indicating abuse. Dubenkos back on the surgery team.

Its Halloween in the ER and there are all sorts of tricks and treats in store. Morris surprises Neela with an unexpected guest as former ER star SHANE WEST reappears.

Morris takes Chaz (SAM JONES III) under his wing and teaches him some risky medical procedures much to the chagrin of Dr. Banfield. Neela gets upset when Dr. Banfield undermines her authority with her intern. Meanwhile, Gates oversteps his bounds with Sam.

Trying to rescue a three-year-old girl from drowning in a nearby lake, Banfield is reminded of her own experience at County with Dr. Greene (ANTHONY EDWARDS) caring for her son.

Sam becomes frustrated with Gates when he becomes obsessed with finding a homeless war hero. Meanwhile, Neela is upset at her intern after he involves the entire surgery department in a nasty lawsuit. A husband and wife come into the ER after someone tried to burn down their home. And after Brenner loses his cool with a patient, it gets physical.

Morris and Banfield are snowed in and trapped at an ER conference in Nebraska. Back in Chicago, Alex and Sarah go behind Sams back and get into a terrible car accident.

Morris receives an unwanted package from his father at the ER doorstep. Meanwhile, Sam is anxious about getting Alex off of the ventilator after his accident.

Banfield treats two brothers that come into the ER with serious injuries after a drug deal goes bad. Gates is upset with Sam over the fact that she never told him that Alex (guest star DOMINIC JANES) was released from the hospital. Neela considers pediatric surgery after treating a young girl with sickle cell anemia. Meanwhile, Dr. Banfield and her husband make a critical decision about the future of their family.

After a crazy day trying to save a young girl with sickle cell anemia, Neela goes in for an attending interview and is surprised to see Dr. Elizabeth Corday (ALEX KINGSTON).

Love is a complicated operation in the ER as Gates cant seem to shake his feelings for Sam and Neela gets flustered when Brenner returns from Australia.

Dr. David Morgenstern (WILLIAM H. MACY) takes a trip down memory lane as he stops by County General and Sams sister (SHANNON WOODWARD) pays an unexpected visit.

After a devastating car accident in the ambulance bay leaves a mother severely injured, Brenner struggles to find a family member to take care of the womans young daughter.

On Valentines Day, Neela falls under the spell of Dr. Brenner, Banfield refuses to give up on having a baby, and Dr. Carter (NOAH WYLE) makes a surprise return to the ER.

Banfield and her husband look into adoption, while Carter adjusts to a changed ER. Sams mother (guest star AMY MADIGAN) comes into the ER in an altered state of mind.

The story of County General is revealed as a camera crew interviews the staff for a documentary on emergency medicine. Noah Wyle and Amy Madigan ("Grey's Anatomy") guest star.

The ER doctors struggle to save two transplant patients when the transplant organs are stranded at the airport. And Carter gets a surprise visit from his old mentor Dr. Benton.

It's Neela's last day at County General and everyone in the ER seems to have forgotten that she is leaving. Meanwhile, Brenner has an epiphany about his troubled past.

The ER doctors and nurses help out at Camp Del Corazon, a camp for kids who have had open-heart surgery, working alongside the camp counselor (guest star TOM ARNOLD).

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.