Urgencias

Dr. Carter, Abby and other staff members are quarantined as the Centers for Disease Control and Prevention probe a mysterious and deadly outbreak.

The shutdown of another hospital floods the ER with patients; Dr. Pratt resuscitates a heart-attack victim who had been pronounced dead.

A patient pulls a gun on Dr. Chen and other staff members, prompting Dr. Carter to lead a walkout when his request for metal detectors is delayed; Dr. Kovac treats an HIV-infected boy whose parents spark his curiosity.

Gallant resents the unfeeling treatment afforded an elderly patient; Carter discovers Abby drank alcohol while out with friends; Kovac flirts with a young patient's mother.

Dr. Corday operates on a man who has a flesh-eating infection; Pratt takes offense at some of the Halloween costumes he sees in the ER; a new surgical intern (Don Cheadle) has a daunting physical handicap.

Dr. Corday clashes with the new surgical resident over a patient's treatment; Abby wonders about her brother's erratic behavior.

Drs. Carter and Chen treat a frightened nanny who may have been impregnated by her employer; doctors frown on a new resident's bedside manner.

Abby searches for her AWOL brother, who may have bipolar disorder, and meets with their mother to prevent his court-martial.

Abby's mother interferes with Eric's treatment; Dr. Pratt treats a young patient with a terrible secret; a baby is abandoned in the emergency room.

Events unfold from end to beginning in a special episode; Dr. Kovac's car hits another on an icy road; the ER staff treats belligerent elves and a female hockey player who has a head wound.

Dr. Pratt brings a gun into the emergency room; Weaver tries to conceal her pregnancy; a woman schemes against her dying husband; Chen treats math students who overdosed on a stimulant.

Dr. Weaver is in a difficult situation when an influential alderman tests positive for syphilis; Dr. Carter is impressed when he meets a man who runs an inner-city clinic.

Dr. Pratt's disabled roommate leads him to a wounded robber. Carter decides to practice medicine in Africa and a doctor makes a pass at Corday.

Abby learns her troubled brother is missing; an automobile strikes a crowd of teenage girls; an alderman gives Dr. Weaver a promotion; Lewis looks forward to a blind date.

Abby comes close to a breakdown while dealing with her mother; Pratt accompanies paramedics; Weaver confronts the man who stole her purse; Lewis has a teenage admirer.

The police question Drs. Pratt and Gallant in regard to a rampage at the diner near the hospital; Dr. Lewis befriends a teenage cancer patient who is smitten with her.

Dr. Weaver bends the rules to treat Alderman Bright's lover for syphilis; Kovac's patient says she was sexually abused at a boot camp for wayward youths; Carter treats a middle-aged woman with a nasty disposition.

Dr. Romano seizes control of the emergency room and offends nearly everyone; Kovac enlists Corday's help in his quest to bring a sickly Croatian boy to the United States for medical attention.

A psychotic patient threatens Abby; Dr. Weaver suspects a woman poisoned her own baby; Dr. Romano continues to make rash judgments.

Carter tries to prevent a grieving gang member from seeking vengeance; Kovac races against the clock to save a Croatian boy's life; a baseball player receives treatment for a heart ailment.

The doctors deal with a burned firefighter, poisoned cult members and a wounded gang-member during a solar eclipse; Dr. Romano undergoes surgery.

Drs. Carter and Kovac vaccinate people at an outpost in Congo, where they find themselves in the line of fire between warring factions.