Carter battles a chemical addiction, trash clutters the halls of the ER as the custodial staff strikes and victims of a football game riot flock to the ER. A riot between playres breaks out in the ER. Benton chokes back his dislike when a good position opens under Romano.
Abby empathizes with the parents of a very prematurely born child. Greene and Corday try to work out their relationship differences. Benton and Romano argue over a homeless man's extensive treatment needs. Weaver and Kovac look after a comatose woman whose same sex love has no legal grounds of decisionmaking. Malucci hides from a woman looking for him. Carter contemplates his future.
Romano takes out a past disagreement on Benton. Carter is uncomfortable with the limitations put upon him because of his drug recovery. An incident at a science fiction convention sends "aliens" to the ER. Corday helps Greene with a procedure through use of an intercom, even as she operates. Frank keeps close tabs on patients he finds suspicious.
Benton is desperate for a new position when Romano sends out words against him. Carter returns to active ER duty. Sparks fly between Abby and Kovac before fate intervenes in the form of a mugger. Malucci tries to avoid putting Greene on the ice for a hockey match if he can find someone better.
Greene takes an ill-fated helicopter ride with a sick heart transplant patient. Benton has his hands full when he tries to run the understaffed ER. Carter ignores a parent's request and tells a teen that he has HIV.
Abby's mother visits. Greene and Corday's vow of some personal time together is shortlived when she has to perform surgery. Kovac thinks a father has been abusive towards his daughter.
It's a bad Thanksgiving in the ER as Abby attempts to rid herself of her mother, Greene receives bad news and Corday finds that she's been sued for malpractice. Chen has to handle her mother's newfound knowledge of her pregnancy. Romano refuses Benton's pay check. A blast goes off in the ER.
Abby's mother makes a scene while shopping. Corday lives through a full day confrontation with her malpractice accusers. Benton hear of gang involvement in a relative's death. Greene worries about Carter's follow through on his drug addiction. Abby is physical with Kovac, but turns to Carter for a shoulder to lean on.
Greene and Corday visit New York. Carter helps Chen with her birthing. Carter faces temptation that would ruin his drug rehabilitation progress. Weaver helps a boy who survived a vicious dog attack.
Greene undergoes a radical surgery for his brain tumor and not without complication. A father and son are treated for a car crash.
Benton finds his relationship deteriorating because of his desire to help a wayward girl. Kovac verbally opposes treating a drunk driver. Greene recovers from his brain surgery. Carter contemplates revealing the temptation he felt to Weaver.
Weaver rethinks submitting a work accident when the illegal operators decide to rid themselves of the evidence with fire. Greene appears deeply affected by the surgery. Benton takes on a new position without learning all the details from Romano. Carter's honesty with Weaver puts restrictions on his prescriptive ability.
Carter gets Abby to attend a familial charity event when his date falls through. Kovac tends to a bishop and a teen who require life-threatening surgery. The staff continues to notice changes in Greene's demeanor.
Greene's continued ability to perform is called into question before a review board. Kovac's lost faith becomes more evident in attending a religious ceremony. Benton finds his new position as director of diversity politically difficult. Weaver is uncomfortable around Legaspi's lesbian acquaintances. Chen returns to the ER.
Carter, Corday and Kovac go to the scene of a train accident and try to help victims on premises. Benton works on a patient with a torn aorta. Kovac seeks comfort from Bishop Stewart with regards to his own familial loss.
Legaspi is accused of sexual harassment by the suicidal girl who caused a train derailment. Abby looks for a baby stolen under her watch. Greene anxiously waits to be cleared by the competency board. Inspired by the Bishop, Kovac examines his life.
An old female patient of Benton's grabs a police officer's sidearm which leads to her shooting death. Carter questions his ties with Rena and helps Abby try to help a busload of students showing sickness from some unknown cause. The results come in on Greene's competency review. Corday wants to show Romano that she is just as capable as she's always been.
Greene and Corday make desperate dashes to get to their wedding ceremony. ER Staffers seek ways to attend. Carter and Abby help victims of an overturned prison corrections vehicle.
Carter and Abby drive to Oklahoma when she receives word that her mother has been discovered there. Corday is brought in to give birth. Benton is frustrated by drunken fraternity patients, but later treats the teacher that founded his interest in scholastics.
Abby testifies before a judge to try and keep her unstable mother from being released from watchful care. Weaver has to give bad news to a tv star from her childhood who has already fallen on hard times. Benton treats his former teacher for a heart attack. Benton injures his hand and learns of Carla and Reese's admission to the ER. Carter is enraged when he learns what put a pregnant woman into the ER.
Abby receives some uplifting advice from her mother for dealing with her mother's condition. Claws are reared when Carla meets Cleo, Benton's current love. Greene finds signs of abuse on a boy he takes care of. Carter is rebuffed when he expresses interest in the chief resident position. Weaver meets Legaspi's new girlfriend with a heavy heart.
Gunshot victims overrun the ER when a foster care facility comes under fire. Greene fears for Corday and their child's life when he realizes his connection to the shooter. Carter, despite awkwardness, helps Chen apply for the chief resident position. Carla's husband accosts Benton. Finch fears she may have come into contact with HIV. Romano fights against Legaspi's continued stay at the ER.