ER follows the medical personnel and patients in the emergency room of Chicago's fictional County General Hospital. 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-death decisions. While they teach the next generation of doctors, each must tackle the demands of their personal lives, at times unsuccessfully.
Season Premiere. Moretti's first day is challenging as the ER is inundated with casualties from the peace rally - including Neela. Dubenko faces a crisis in surgery. Abby, Pratt and Morris conspire about how to deal with a shared problem. A new intern arrives unexpectedly, and Gates is reassigned.
Moretti begins to make his presence felt, as he implements changes in the way patients are seen. The ER staff differ on how procedure when a patient comes in with a bullet in him needed as evidence. Neela finds herself the object of more attention that she wants, or needs. Abby had passport woes, and struggles with the changes being made. Pratt and Morris find themselves forced to defend their actions, Hope prepares for a new mission, and Gates finds himself labeled the reject in his new assignment.
Two wounded police auxiliary officers present challenges in the ER. Neela settles in with Abby as she recovers, while Pratt and Bettina consider their relationship. Gates tries to get a patient on a drug trial, with Dubenko's help. And Morris is in a funk that not even a pretty woman can help.
It's a bad day for Abby, who's missing the still-absent Luka, when Joe is brought to the ER after a fall and is unable to reach Luka. Elsewhere, the day puts family first as Morris cares for a frightened child and Pratt defends his brother. Neela returns to work, and Moretti returns from a conference. A patient's mother gives the ER staffers makeovers in appreciation. The ER gets a new receptionist.
Moretti (Stanley Tucci) decides that Gates is ready to return to the ER; Neela must mentor a young genius intern (Steven Christopher Parker); Morris has a hard time resisting women while Hope is away.
Morris and Pratt cram for their medical boards when Morretti brings in a new attending physician (Kari Matchett) to help with the load; Sam and Abby work on an attention-hungry patient who comes into the ER with elusive symptoms.
A power outage strikes on an unusually hot day, bringing nursing home patients suffering from hyperthermia to the ER. Abby and Pratt disagree about diagnostic tests for a fussy baby. Morris and Pratt get their board results, and the ER staff celebrates at Ike's. Moretti and Abby's interactions intensify, and Abby finds herself at a dark and frightening crossroads.
Everyone at the ER is happily surprised to see Luka back from Croatia. Great news awaits Neela. Sarah once again needs rescuing by Tony, and patients are causing problems for Morris.
It's time for changes at the ER when Anspaugh makes an unpopular decision. Abby has old demons to fight with, which distance her from friends and family. Even Luka seems to be at a loss to help Abby. Love is in the air when a secret romance blooms between two doctors.
ER's 300th episode finds Luka and Abby hurriedly preparing to travel to Croatia after Luka's father passes away. Luka confronts Abby about the estrangement between them, and she eventually reaches out and asks for his help. A man rushes to the ER when his wife is seriously injured in a car accident, and finds someone very unexpected there with her. Julia holds a service to bless the ER and remember the patients that have been lost through the years.
After being passed over for Chief of the ER, Pratt is looking for a hospital that will appreciate his talents. A former employee of the ER brings her sick son in for tests. Neela's cousin is in town for a visit, and Morris and Harold compete for her affections.
Abby is back from rehab and finds herself the object of scrutiny. She confesses to Pratt that Luka might stay in Croatia longer than planned. Harold seems to have won over Neela's cousin. Multiple victims from a fire fill the ER.
Neela's short visit in Ortho turns into a game of hockey. Bettina wants to take her relationship with Pratt to the next level, but Pratt is not keen on the idea. Gates and Sam disagree over a patient. Julia provides some spiritual guidance in order to ease a prison doctor's bad conscience.
Pratt and a new doctor on the scene disagree on how to teach the interns. Gates treats a young woman with serious heart problems. Abby heads to Croatia, and ponders whether and how to tell Luka about her unfortunate choices. Sam discovers that Julia has moved on in more ways than one.
Neela, worn out after being on shift for over 24 hours, has to make a quick decision regarding an accident victim's torn aorta. Sarah's grandparents are in town, and Hank is rushed to the ER after collapsing during an outing. Gates tries to convey to Sam that his feelings for her are serious.
Kovac is in Chicago looking for hospice-care work. Neela's aorta surgery has caused an infection in her patient. Abby treats a teen who has been beaten up. Brenner continues to cause problems for the ER staff.
There's been a jewelry robbery in town, and Neela finds out that one of her patients might have had something to do with it. Pratt makes an effort to save his relationship with Bettina, and Abby worries about her marriage, sensing that Luka may have given up on it.
Neela's aortic rupture patient is in need of yet another follow up surgery, and they are starting to take a toll on her. Morris talks with a shrink about his experience with the jewelery thieves. Abby needs to make a tough decision when a new opportunity is presented to her.
Season Premiere. In the minutes following last season’s finale, multiple departments spring into action to deal with the aftermath of the shooting. A bound and intubated Luka and a bleeding Abby are found, but is it in time to save their baby? Meanwhile, the surgical team fights to repair Jerry’s injuries. Steve and his partners, with a kidnapped Sam and Alex, flee north, but circumstances force deadly action.
A closeted, older gay man with kidney failure comes to the ER. He must choose between his partner, a female impersonator, and reconnecting with his family. Legal troubles loom for Luka. Pratt and Kerry must adjust to new roles. It’s the first day on the job for the medical students and interns, and Neela and Gates have a tough start.
A grandfather and grandson are injured in a chainsaw accident, leaving Luka stuck upstairs with one of them in a difficult case. Pratt has his trial-by-fire when he has to handle the ER alone, juggling multiple traumas, teaching duties and a troublesome intern. Neela mentors a new med student, and lends a hand when Pratt makes a serious error. Abby enrolls in a “Mommy and Me” class, but it’s not all fun and games.
Award winning actor/director Forest Whitaker begins a six-episode arc as Curtis Ames, a carpenter who suffers a stroke under Luka’s care and then sues him for malpractice. In the opener, Luka and Ames square off in court as each man’s recollections of Ames’s treatment are recounted via testimony and flashbacks. Meanwhile, Luka worries about the implications of the suit and the possible outcomes. Abby returns to work and must adjust to the dramatic changes in her life. An equipment shortage hampers Pratt, Abby, and Neela’s treatment of a patient, leading them to attempt a risky procedure. Pratt’s early morning trip to the barbershop results in a new awareness of community need.
Luka gets some important news, and at the end of the day, an unexpected visitor. A collision between a motorcycle and a car brings critical patients to the ER. Luka and Ray treat the motorcycle rider, and discover a condition his wife wants kept secret. Abby and Neela work on the driver of the car, but his surgery doesn’t go well and his wife soon has troubles of her own. Pratt has a new lady in his life, and a new roommate, while Gates has a different kind of girl-trouble. The women of the ER take some time for stress relief.
A belligerent young man with the flu presents a challenge to Morris and Sam when he refuses treatment, and later turns out to be more than he seems to be. Luka and Abby’s childcare emergency means balancing baby care with patient care in the ER until a nanny can be found, but the candidates prove less than satisfactory. Luka has an uneasy encounter with Curtis Ames at the hospital, and later Abby and Baby Joe have a "chance" encounter with Ames at the park. Pratt discovers a local church's risky drug exchange program. Neela and Gates square off at an M&M.
Luka and Abby treat a man injured after driving drunk, but differ about what should be done when his wife appears to have been abused. Later, Luka receives an unsettling package and Abby meets an intriguing stranger. A group of street kids come to the ER when they think one has rabies, and find a guardian angel in blue. Pratt disappears from the ER for a community-related reason, and learns a surprising truth about a family member. Kerry’s TV appearance becomes a real emergency.
It’s Thanksgiving in the ER, and everyone prepares for the festivities. Luka and Abby's shared feast is delayed when a medical evacuation flight to transfer an older patient puts Abby in the middle of a bus crash scene where she earns the respect of the flight crew. Luka shares concerns about a worrisome former patient with the police, who have doubts about what he thinks is happening. Pratt turns to Kerry after learning about Chaz, and Gates tries to charm Neela, but Meg adds a sour note.
A teenaged girl is found in front of her school, bleeding and apparently raped. As Luka and Gates treat her, Abby and Neela try figure out the truth about what happened, while Luka must help the girl's mother, a colleague. When the police are no help with Ames, Luka decides to confront the problem. Abby's friend from Ike's returns. Pratt struggles to cope when his brother comes out. There’s a new nurse on the floor, but can he handle the ER? Meanwhile, Ray’s got a secret and Gates pours on the charm, but Neela’s not impressed.
It's Christmas in the ER again. Luka and Abby as Rudolph and his elf, visit pediatrics, while Morris learns the meaning of Christmas when he plays Santa to a special girl. Ames takes action that creates tension between Luka and Abby, leading Luka to make a heartfelt confession. Teller returns, sending Gates and Ray on a mission, while Neela oversees an unusual kidney transplant case. Sam and Ben take a stand when a patient is dumped in an alley by Mercy Hospital. Morris, after getting a visit from one of his children, gets an offer he can't refuse, but somehow, does.
Kerry gets an interesting new job offer in Miami. Budget cuts force Luka to eliminate an attending position: Kerry. As word gets around the ER, emotions run high, and the Kerry fights back. Pressed by the staff, an angry Abby confronts Luka, creating tension between them. Pratt's efforts at community service lead to an unanticipated turn of events when a patient dies from the side effects of medication received at the clinic. Later, he learns the case will be investigated, leading him confess his role to Luka, but to protect Hope. Gates' home life intrudes on the ER, affecting Neela. Morris' missing credit card has Sam concerned about Alex' role in the loss.
Divisions abound in the ER as the aftermath of Luka’s and Pratt’s actions are felt. A patient’s call creates friction between Luka and Abby. A contentious family case leads Gates and Ray differ over treatment of one child, while Luka and Abby clash when she needs help with the other. An unauthorized phone call has serious implications for Pratt. Ben takes things to the next level with Sam, but Sam’s cautious, and Ray wonders if he’s lost his chance with Neela.
Luka tries to extricate Pratt from a legal mess while Abby, confronted by a vengeful Ames, tries to reach him. Later, Luka finds himself in a tense confrontation with Ames, and Abby must act to protect her family. Neela and Gates rush to get Meg to the hospital. Sam’s new home is soon under threat from fire, but will everyone escape unscathed?
Morris becomes the man of the hour in a busy ER while Pratt must defend his actions, and accept the consequences. Luka faces the ER in the aftermath of the Ames incident. Abby and Sam treat a dying comedian who is unable to make his final appearance. Neela gets her big chance to assist on a double kidney transplant. Ray realizes all may not be lost, after all. And who makes a surprising decision at the end of the day?
Luka, Sam and Gates treat a woman who appears to be suffering liver failure, but is that really all there is to it? Luka confronts Gates when he tries to lie on a medical document. Abby treats a couple with injuries resulting from an unusual ceremony, and a fortune-teller with a prediction for her future. But what’s their secret that Luka lets slip? Neela prepares for another kidney transplant, but something seems amiss to her, leading to a confrontation with Dubenko. Ray treats the victim of an unusual fall, and Alex’s troubles continue to intrude on Sam’s work life.
A blizzard moves into Chicago, stranding a family in the snow. Pratt, Abby, Hope and Ray must struggle to save the family, and keep hope alive when they learn one member is still missing. Luka’s got a problem intern in his sights, and he’s not pleased. Later, a gang shooting challenges Luka and Pratt. Meanwhile, Luka and Abby begin making wedding plans, but is their engagement still a secret? Sam makes a difficult choice about Alex, and wonders if she’s failed him. Neela discovers she’s no longer Dubenko’s favorite, and Gates has an unexpected, and unwelcome, visitor.
Luka, Abby, Pratt, Morris and the team treat the victims of collision between a big-rig and family car, including the wife of the truck driver and the son of the car’s driver. Sam celebrates her birthday in the ER and meets photographer who changes her outlook on life. Neela and Ray share some subtle signals, but what’s up? Gates is shadowed by a medical student who notices his errors. Wedding plans continue as Luka and Abby try to decide where to be married, but someone else is handling the bachelor party.
When father-and-son (guest stars Robert and Andy Prosky) come to the ER, Luka must treat the son’s failing heart while he takes on responsibility for the father. Language presents a challenge when Neela and Abby treat a good Samaritan. Meanwhile, Pratt tries to help Chaz make a new career choice, Gates has troubles with his own father, and Sam’s got her hands full with a seminar on handling aggressive patients. And who’s the John Doe Abby’s treating, and hiding from Luka?
In only 12 hours, a pressured Luka must coordinate the emergency closure of the ER, as the team rallies to make provisions for patients. Chaz is admitted to the ER, worrying Pratt, and Ray is challenged by a young patient. Sam renews her friendship with the photographer Diana, while Gates faces new problems on the father front. At day's end, as the lights go out, Luka makes a pivotal decision about his future.
Luka’s carefully arranged formal dinner for the ER staff gives Abby the surprise of a lifetime when she discovers the real reason for the evening. Luka finds himself dealing with Abby’s reaction, but love prevails, and in the end, events come off as planned. As the celebration continues, Pratt plays an important role with a bit of panache, Morris and Hope find themselves with an opportunity they can’t resist, and Neela finds herself the center of all manner of unexpected attention.
Dr. Kevin Moretti, an ICU specialist bent on change, joins the ER team. Change comes elsewhere as Luka and Abby adjust to being husband and wife, Pratt tries to be a new man to his lady friend, Morris and Hope take things to the next level, and Ray goes missing. Later on, Luka gets a troubling phone call.
Season Finale: Luka postpones his honeymoon, leaving Abby, Joe and the ER behind to begin a different journey. Meanwhile, it's Moretti's first day as Chief of Emergency Medicine, and everyone feels the effects of his style, especially Pratt and Morris. Neela learns of Ray's fate, then joins an anti-war rally and finds herself in a dangerous situation. Gates faces a crisis on the home front.
Abby awakens after the ambulance explosion and rushes to check on Pratt; Sam and Gates rush to the scene; Morris and Neela struggle to keep up with Pratt's injuries.
Everyone in the ER is trying to cope with the loss of their colleague. The staff feels defensive toward the new Chief and her tough disposition. Gates and the new interns treat a bio terrorist, who has a lethal secret that endangers them all. Neela makes a great effort to get Dubenko back on the surgery staff, and gets help from an unexpected souce.
Neela is upset when she finds out Abby's good news second hand; the new chief, Catherine Banfield, and Abby disagree on how to treat a gunshot wound victim; Abby defends Sam when she goes before a nurses disciplinary board.
Banfield is caught off guard when a man tries to steal her wallet; Dr. Dubenko returns to the surgery team; a family member is suspected of hurting a young gymnast; Sarah gets her tongue pierced.
Sam's time is taken up by her studies for a pharmacology exam, leaving Gates feeling neglected. A school fight results in a stabbing, with Brenner treating the victim and trying to uncover the truth behind the story. Morris has a surprise for Neela. Gates gets locked in a stairwell with a quiet young boy on Halloween night.
Dr. Banfield is irritated when Morris takes Chaz under his wing and teaches him risky medical procedures; Neela is unhappy when Dr. Banfield undermines her authority with an intern.
Dr. Banfield takes a run to clear her head but finds herself trying to rescue a three-year-old girl from drowning in a nearby lake. Gates tries to pull some strings in the ER to help his homeless war hero. Banfield is reminded of her own experience at County with Dr. Greene caring for her son as she tries to save the young three-year-old girl from certain death. Meanwhile, the interns continue to struggle to keep up in the ER.
Sam gets frustrated with Gates when he gets obsessed with finding a homeless war hero. Neela is upset at her intern after he gets the entire surgery department into a lawsuit. A husband and wife come into the ER after someone tried to burn down their home. Brenner loses his cool with a patient and it gets physical.
Doctors take care of 24-year-old Gloria Ortiz who is 8 months pregnant. The woman fell during an immigration raid at a tie factory and started getting contractions. Coburn discovers that the baby has a mass in the neck and head area... maybe cancer? Immigration agents come to the hospital to take Gloria into custody. Banfield has Morris do paperwork instead of seeing patients. Frank plans to dress up as Santa for the Christmas party. Neela has no intentions on going to said party claiming that last year turned out bad since Morris pinched her butt and Frank almost threw up on her. Sam pushes Dubenko to extubate Alex today instead of tomorrow. Neela is at the center of a malpractice suit.
Alex is set to be released from the hospital. Doctors treat African-American brothers Curtis Bennet, 17, who has abdominal pain and 10-year-old Quincy Bennet who has a knee injury. Both were injured during a drug deal that went terribly wrong. There's still some residual tension between Gates and Sam. A female patient in police custody doesn't want to be examed by Morris. A 13-year-old patient named Anastasia messes with Neela's love life.
Neela has a recurring dream; Gates tries to save a patient who jumped out of a window while sleeping; Neela is surprised to see Dr. Corday (Alex Kingston).
Morris tries to help a girl who was hit while riding her bike; Gates can't get over his feelings for Sam; Neela is flustered when Dr. Brenner returns from Australia.
Morris and Gates treat an older man who was assaulted on the street; Sam gets a surprise visit from her sister; Dr. Morgenstern visits County General when he discovers an old mentor is ill.
A mother is severely injured by a car accident in the ambulance bay; an insurance company frustrates Morris; Neela tells Brenner about her offer in North Carolina.
It’s Valentine’s Day in the ER and Neela seems to be under the spell of Dr. Brenner. Gates treats a bizarre mushroom hunter that comes in on his wedding day with breathing problems. Banfield refuses to give up on having a baby but is having trouble convincing her husband of her plan. Neela gives a little girl great news about her mother’s heart transplant surgery but is disappointed when a critical mistake is made. Meanwhile, Dr. Carter makes a surprise return to the ER.
After getting frustrated with In Vitro Fertilization Dr. Banfield and her husband decide to try an adoption agency to fulfill their dreams of having a family. Dr. Carter quickly tries to jump back into working at County but struggles with all the new procedures and technology. Sam is shocked when her mom comes into the ER in an altered state of mind
A camera crew interviews the staff at County General for a documentary on emergency medicine. Morris’ cop girlfriend gets injured on the job and is rushed into the ER with gunshot wounds. Neela wonders why her relationship with Brenner lacks so much communication. Sam struggles to make amends with her mother.
Neela and Sam are shocked when they arrive back to the airport with transplant organs only to find that their plane has left them. Dr. Carter gets a surprise visit from an old friend while waiting for his kidney transplant. Dr. Banfield bonds with an abandoned baby boy that is left at the ER.
It's Neela's last day and everyone in the ER seems to have forgotten that she is leaving. Neela proves she is ready to be an attending when she and Dr. Dubenko argue about the treatment of two surgical cases. Meanwhile, Brenner has an epiphany about his troubled past.
Many of the ER doctors and nurses help out at Camp Del Corazon, a camp for kids who have had open heart surgery. Working along side the camp counselor, Morris and Brenner make a huge impact on several kids at the camp. Meanwhile, Dr. Banfield and her husband feel their adoption dreams slipping away when a young mother comes back for the child she abandoned in the ER.
Gates works on a young teen brought in with alcohol poisoning after playing a deadly drinking game with friends. 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. It’s Sam’s birthday and Alex and Gates surprise her with a special gift. Meanwhile, Carter works with an intern to save a mother in labor with twins.
Dr. Ross wants to become an ER pedes attending. Scott Anspaugh decides to stop fighting when faced with the prospect of an experimental new chemotherapy treatment. Jerry and Mark take charge of the annual ER banquet. Benton is forced to take over an operation by force when Morganstern is unable to continue. Carol worries that Millicent Carter retracted the funds for her clinic. Anna donates bone marrow.