The hospital suffers through a series of power outages. Carol’s decision to send Doug a fax about her pregnancy is thwarted by the power outages. The staff is on alert…

Weaver reprimands Carter for doing a dangerous procedure without consulting Kovac. She also talks to Hathaway about Hathaway’s lack of focus on the job. And while treating a 6-year-old patient…

Greene assists paramedics in treating injured children at a school bus accident. En route, Doug and Jeanie survive their own accident. Kerry stops Doug from treating Jeanie…or any other patient….

After Corday refuses to perform exploratory surgery on Cleo’s patient, Cleo enlists Benton’s help, infuriating Corday. Abby cares for a pregnant woman with five children who wants an abortion. Greene…

Carter and Lucy are discovered and the staff struggles to save them and go on with normal patient care.

Doug jeopardizes future federal grants for the entire ER when he breaks a double blind study by giving a sample drug to an ailing patient. Doyle lodges a sexual harassment…

Lucy’s patient finally gets a heart transplant but does not survive. The transplanted heart will now go to another recipient. Greene interferes in a gay domestic situation. Corday tricked her…

Carter plays tour guide for Ruth Johnson, who was born in the hospital 100 years ago to the day, and her large family. Carol treats a boy who was hit…

After Mark saves a 16-year-old assault victim in a daring rescue, he tries to convince the boy to leave the streets for a shelter. Carter loses his beard when two…

Dr. Corday commits a deadly error after being on-call for nearly 36 hours straight. Peter visits Dr. Kotlowitz and receives encouragement regarding a cochlear implant for Reese. Dr. Amanda Lee,…

In order to get her paitient to tell her the location of a missing body, Corday agrees to grant him a fatal wish. Kovac befriends two brothers. He tells Weaver…

A prank in a high school science class goes terribly awry, injuring a teacher and several students. Hathaway discovers Meg’s drug addiction. Weaver and Greene notice Lawrence gets easily confused.

Dr. Corday begins her first day as an intern, first by being assigned to Dale Edson, then being treated as Romano’s lapdog. Kerry is interviewed for ER chief. Doug and…

A recommendation from Weaver allows Jeanie to have temporary approval as a foster parent for baby Carlos. Reggie and Jeanie get married. Lucy and Kovac talk with a young woman…

Hathaway befriends an out-of-work waitress, Meg. Seven-months pregnant, Meg cannot afford prenatal care. Hathaway invites her to the hospital, performs free tests and helps her interview for a job in…

The ER is flooded with foster care home residents, attacked by a shooter bent on tracking down his son, who , with the help of Dr. Green, was put into…

Numerous mishaps threaten to mar Corday and Greene’s wedding day. As the very pregnant Corday becomes increasingly agitated, the presence of her bickering divorced parents does little to improve her…

Abby and Carter travel to Oklahoma to rescue Abby’s mentally ill mother and bring her back to Chicago. In Chicago, Maggie suffers from a sleeping pills overdose. At County General,…

Maggie contests Abby’s attempt to institutionalize her. Weaver treats a few bizarre patients. When Legaspi returns to work after being exonerated of sexual harassment, Weaver tries to reconcile with her….

Just when the ER is understaffed and swamped, two children who were brought in turn out to have full blown smallpox. The entire ER must be locked down. The staff…

In the series’ 150th episode, a massive train wreck mobilizes the emergency room doctors. Corday, Carter and Kovac rush to the scene. Corday falls and injures her back, bringing on…

Drs. Corday and Greene are awkward when working together in the ER. Dr. Weaver treats victims of an intense fire that may take the life of a dear friend.

Greene returns to work but confuses words and displays uncharacteristic anger. Eager to get out of his per diem situation, Benton agrees to a full time position. Carter visits his…

Weaver becomes concerned about Greene’s cognitive skills and surreptitiously calls for an official evaluation of his competency. Corday plans her wedding to Greene. Bishop Stewart returns, and Kovacs realizes the…

Carter’s day shift and Pratt’s night shift (his final shift at County) are intercut. Both men have extremely busy days. Doc Magoo’s burns down. Luka calls Carter from the Congo…

Benton and Cleo clash over his deceased nephew’s girlfriend. They finally agree to call a social worker. Benton confesses his love to Cleo. The spinal surgery malpractice suit is settled…

Dr. Carter tries to prevent a grieving gang member from going after vengeance. Dr. Kovac races against time to save a Croatian boy’s life. A baseball player gets treatment for…

Dr. Romano seizes control of the ER and manages to offend everyone. Dr. Kovac asks Dr. Corday’s help in the quest to bring a sickly Croatian boy to the U.S….

An accidental overdose brings Drs. Green and Corday’s baby into the ER.

Greene confronts Corday when she orders Rachel out of their home; Abby tries to protect a battered neighbor who refuses to press charges against her husband.

Chen gives birth, but insists on breastfeeding the infant before she gives it to the adoptive parents. Greene and Corday consult a brain specialist in New York City who believes…

Abby comes close to breaking down trying to deal with her mother. Dr. Pratt goes for his required paramedic ride-along. Dr. Weaver confronts the man who stole her purse. Dr….

Dr. Carter is allowed a cautious restart with small steps. An extremely blond Dr. Malucci is very curious who’s made Dr. Chen pregnant. Dr. Benton has been written out of…

Dr. Susan Lewis arrives, looking for work in the Chicago area again. Greene hires her, over Weaver’s objection. Chen nervously attends a risk management review, accompanied by the unforgiving Weaver,…

Weaver returns to the emergency room after a self-imposed sabbatical of three weeks, wondering how her newfound lesbian identity will affect her workplace relationships. Having purposely allowed a mass murderer…

Kovacs stops to help a woman and her son whose car broke down. Steve is getting close to Alex, and Sam panics. Abby is looking for her letter whether to…

After another hospital shuts down, the ER is flooded with patients. Dr. Pratt resuscitates a heart-attack victim who had been pronounced dead.

Dr. Carter leads a walk-out of staff protesting lack of security in the ER.

A panic-stricken Weaver is ordered to give her son to the Lopez family. Carter greets the returning Kem, but their meeting with his father, Jack, gets tense after Carter announces…

Dr. Carter, Abby and other staff of the ER are quarantined as the CDC investigate a mysterious, deadly outbreak.