An enthusiastic third-year medical student learns that becoming a doctor is more difficult than she expected, Ross is on probation, and Greene's daughter is staying with him for the summer
Benton discovers his son has severe hearing loss. Meanwhile, Corday makes an important decision about her future, and Carter saves money on rent but loses sleep.
Ross becomes the new paediatric ER-attending doctor despite Weaver's objections, and Greene becomes Rachel's hero when he treats a constipated horse
Weaver has an interview for a permanent job as chief, Jeanie is forced to make a life-or-death decision, and Hathaway and Evans clash over how to control a gang member
On Halloween night, a party at the medical-student dorm almost proves fatal for two students, while Weaver gets some disappointing professional news, and Corday gets a nice surprise from Benton
Greene risks his life to save a teenage male prostitute, while Carter seeks a new place to live after being sacked as resident advisor, and Weaver learns that the committee has appointed someone else
Weaver takes pleasure in watching Anspaugh flounder, while an exhausted Corday nearly kills a patient, and Greene reacts badly to a practical joke played on him by the paramedics and firefighters
In order to save the life of a young girl who needs a transfusion, Lucy and Carter try to cease their bickering while searching Chicago for her father who is a match for her blood
The hospital celebrates its 100th anniversary, while Hathaway treats an eight-year-old boy who purposely shot and killed his friend, and Benton investigates cochlear surgery for Reese
On Christmas Eve, a brain-dead patient gives the gift of life, Benton will not let Romano operate as he thinks that Romano is drunk, Corday meets a new beau, and Lee exhibits bizarre behaviour
Greene uncovers a big secret about Lee and that Anspaugh did not look into her credentials, while a care worker suggests to Benton that Reese has special needs that require assistance
Ross jeopardises a hospital study, Romano is accused of sexual harassment and Hathaway reprimands Evans after she discovers that Evans applied for a grant without consulting her
Weaver interviews Corday about her complaint concerning Romano's behaviour, and Romano threatens Benton's career, while Greene befriends a Nigerian hospital worker who has back pain
Chicago is battered by a snow storm that causes a horrendous crash between a bus load of youngsters and a snow plough. Joi Abbot's son dies of a drug overdose and Ross is blamed.
While Greene struggles to save the children trapped in the crashed bus, Hathaway tries to salvage her clinic by offering to resign, and Ross does resign from the hospital
Benton travels to a small, rural town in Mississippi to administer to the sick at a small clinic run by a Catholic nun. Back at the ER, Jeanie suffers a medical setback.
Weaver treats a celebrity wrestler, and Hathaway doesn't tell anyone the real reason why she has headaches. Meanwhile, Carter hits a teenage boy while driving for the paramedics.
Greene helps Mobalage so he can testify at his own deportation hearing. Hathaway befriends a paranoid schizophrenic who delivers a normal baby, and Lucy's patients don't take her seriously.
Carter mentors a student, Lucy shows impressive skills during her psychiatric rotation, and Greene and Corday dance a tango. Mobalage leaves his job to pursue a civil engineering license.
As Carol prepares to fax the news of her pregnancy to Doug, a massive power cut hits Chicago General and shocked ER staff realise that a rapist is stalking the hospital corridors
FBI agents secretly bring a patient to the emergency room, meanwhile a terrible car accident occurs involving students. Hathaway is disappointed with Ross's reaction to the news of her pregnancy.
Weaver brings in a small boy found ill and abandoned on the streets, Knight comes off her long-term medication, Greene and Corday share a kiss, and Hathaway discovers that she is expecting twins