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.

Benton struggles with the idea of taking a DNA test to determine whether or not Reese is actually his son. As the signs continue to pile up, Kerry and Mark…

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…

After his mother’s funeral, Dr. Greene comforts his father in San Diego. In Chicago, Romano surprises Corday by appointing her associate chief of surgery. Corday treats Elaine, Carter’s lover, for…

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…

Third-year med student Lucy Knight reports to the ER for the first day of her rotation. Greene takes a teacherly interest in her, helping her get acquainted, but she gets…

When Anspaugh decides to retire as chief of staff and return to surgery, he appoints Romano as his replacement. Greene expresses reservations about the decision, but Weaver does not support…

Ross treats a 6-month-old recovering from methadone withdrawal. A televangelist and his wife, who’s suffering from an infection, plan a broadcast from the ER. Del Amico’s old boyfriend arrives, and…

Ross and Hathaway’s jobs are in jeopardy after their unauthorized treatment of a drug-addicted 7-month-old boy is discovered. Corday loses her sponsorship. Carter suspects Del Amico’s boyfriend when drugs are…

Del Amico, Ross and Corday confront disturbing situations after the bombing of a women’s clinic. Benton comes under review for controversial actions in the OR. Jeanie endures one of the…

A 31-year-old security guard is brought in suffering from severe chemical burns, and a 21-year-old man is wheeled in after falling 75 feet into a river. Meanwhile, Benton is upset…

Jeanie fears Scott Anspaugh’s cancer may have returned. Hathaway learns a disturbing secret about a 16-year-old girl. A pregnant patient fears she’ll miscarry; Morgenstern returns to work, but perhaps too…

Carter finally works up enough nerve to ask Del Amico out. Jeanie tries to help Scotty decide whether to undergo an experimental treatment and Benton takes unexpected action during an…

Kerry starts to doubt the methods of Synergix. Carter tries to help his cousin beat his drug addiction. Jeanie becomes Scott Anspaugh’s part-time caregiver.

Another elderly rape victim is brought in. So is the rapist.

Because of benzene that’s been spread, the ER has to close. Weaver gets felled and Carter has to take the lead.

Mark treats an old lady who has been brutally raped. Carter’s grandmother visits Carol’s clinic. After he’s touched by Benton, a blind man can see again!

Dr. Anspaugh’s 13-year-old son is brought in and Anspaugh asks Mark to look after him. Another old lady who has been raped is brought in.

Benton has a very extraordinary and interesting case when he comes across a boy with reversed internal organs.

Jeanie believes she’s been fired because she has HIV and fights her dismissal.

Cynthia Hooper starts as the new desk clerk. Benton and Carla disagree over whether or not their son should be circumcised. Al gets in an accident at work.

His ex-wife Jennifer tells Mark he can’t see Rachel until he’s got his act together. Reece gets to go home. Al has lost his job.

Carol would like to have a women’s and children’s health care clinic within the ER. Benton has trouble combining work and fatherhood.

Carter is exited about getting his own med student and Mark and Carol interview candidates for the desk clerk position.

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…

While a film crew is filming in the ER, it’s Elizabeth Corday’s first day.

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….

A demented patient causes a shootout in the emergency room. After terrorizing people in the ER with a gun, she gets shot by a policeman. She soon dies. Benton later…

As the new director of diversity, Benton studies medical school applications and discovers that his own academic record did not qualify him–he was admitted because of affirmative action. Weaver feels…

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…

As Dr. Greene’s brain tumor begins affecting his coordination, he becomes concerned that his fate will be similar to the terminally ill patients he treats.

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…

After Dr. Corday moves out, Dr. Green fights loneliness and pain by immersing himself into his work. Dr. Chen discovers that a comatose teen is ready to give birth.

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…

After some staff members are caught going through a dominatrix’s bag, Weaver makes them attend a sexual harassment seminar, where they learn about each other.

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