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Greene and Corday contract poison ivy. Dr. Chen keeps her pregnancy a secret. Carter finishes a drug rehabilitation program. Romano appoints Benton as a new surgical attending physician.

Carter encounters Abby at Alcoholics Anonymous. Later, she reluctantly agrees to be his sponsor. An elderly diabetes patient who's inconsistent with dialysis appointments needs surgery.

Romano terminates Benton after being fined for a matter that Benton reported to the county inspector. Abby and Kovac share a kiss. Malucci insists on finding out the father of Chen's baby.

Benton is unable to find a job after Romano influences local hospitals. He reluctantly agrees to accept Romano's demeaning offer. Kovac and Abby are attacked by a mugger with a steel pipe.

Greene flies in a helicopter to a remote area to rescue a heart transplant patient. The helicopter develops problems, and Greene arranges for paramedics to transport the patient to County.

Corday rushes through a surgical procedure to take off on a romantic weekend. She is called back to the hospital after her patient suffers complications. Abby's mother, Maggie, unexpectedly visits.

Greene hides the news of his brain tumor from Corday. Corday finds out that she is being sued for malpractice. She also reveals to Greene that she is pregnant. Abby's mother refuses to leave.

Maggie refuses her medication, becomes combative and flees the hospital. Abby finds solace with Kovac. Corday undergoes questioning in a malpractice suit and lies under oath to hide her error.

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.

A car accident injury is a result of a father's undetected heart condition, and he undergoes heart bypass surgery. In New York City, Corday comforts Greene as a brain specialist removes the tumor.

Benton and Cleo clash over his deceased nephew's girlfriend. They finally agree to call a social worker. The spinal surgery malpractice suit is settled but Corday now doubts her abilities.

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 cousin.

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.

As the new director of diversity, Benton studies medical school applications and discovers he was admitted because of affirmative action. Weaver feels uncomfortable amongst Legaspi's lesbian friends.

In the 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 early contractions.

Weaver fears for her own reputation when Legaspi is accused of sexual harassment. An infant is abducted from the hospital and later found on a train platform.

A demented patient causes a shootout in the emergency room. Benton later discovers her dementia was caused by an aftereffect of his surgery that he and Cleo should have detected.

Numerous mishaps threaten to mar Corday and Greene's wedding day. The emergency room is inundated with female prisoners whose bus crashed.

Abby and Carter bring Abby's mentally ill mother back to Chicago. Benton treats his former high school teacher, who first awakened his interest in science. Corday gives birth to a beautiful girl.

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

Cleo and Carla clash after Reese is hurt while in Cleo's care. Weaver and Kovac cannot save the life of a developmentally challenged woman's caregiver. Abby goes to a therapy session with Maggie.

Cleo breaks a vial of AIDS-tainted blood. Kovac submits Abby's application to reenter medical school without informing her. A gunman kills and injures over one dozen children and adults.