Cruz and Monroe are trapped when gang members attack the precinct station and set it ablaze; the gang leader (Wyclef Jean) is able to escape in the confusion as the fate of the station house and a dedicated officer are in jeopardy.
Yokas tries to negotiate a peaceful resolution to a televised hostage crisis in which a young man (Chris Stack) is threatening to kill his father, who had sexually abused children while heading a bizarre religious cult.
Officers Davis and Finney are injured in a traffic tie-up that ends when a driver goes berserk and shoots two parents, then allows their teenage son to escape.
Cruz thinks she sees her dead sister when she delves into the world of the cultic Santeria during an investigation of a woman's death.
Bosco discovers that Monroe spied for Internal Affairs, which led to his near-fatal shooting, and he regrets being partnered with her.
When a murderous gang chieftain (Wyclef Jean) attempts to consolidate his power, Cruz seeks to lock him away by using an incriminating testimony.
When a jewelry thief who is AWOL from the Army displays symptoms of an unknown contagious disease, Dr. Connor (Neal McDonough) and Dr. Durant (Kelli Williams) go to New York to investigate.
Sgt. Cruz must set aside her bad news to concentrate on finding the man who killed a hostile witness in a murder probe; Grace is convinced she has found her long-lost mother (Helen Mirren) living as a junkie on the streets.
Finney and Davis race to save a boy (Zach Savage) whose abusive father has kidnapped him; Carlos comes to a shaky understanding with his romantic partner, fellow paramedic Levine.
The precinct station is secretly evacuated when a dying Islamic terrorist is found to have high levels of radiation on his body; Cruz and a federal agent (Mykelti Williamson) search for accomplices and the source of the material.
Sullivan goes for broke in his corruption case against Capt. Finney (Charles Haid); Cruz teams up with a handsome federal investigator (Mykelti Williamson) when a bomb explodes in a diner.
Sullivan recruits Officer Monroe in his quest to bring down the corrupt Capt. Finney (Charles Haid) by locating former members of the anti-crime unit that killed his partner.
The other officers discover that Monroe is secretly informing Internal Affairs about an irate Sgt. Cruz and Detective Yokas.
Officer Davis jeopardizes his life and career as he seeks revenge upon Capt. C.T. Finney (Charles Haid) for the murder of his father 20 years ago.
Battered Cruz returns to the precinct after her arrest ordeal and encounters a city councilman who was horribly beaten but refuses to name his attacker; Davis gets an earful when he finds the convict who murdered his father years earlier.
Detective Yokas is conflicted when Captain Finney drills her for information that will help Internal Affairs convict Detective Cruz.
Detective Yokas continues to work with intense Lt. Miller (Aidan Quinn), who is bent on finding a serial killer after another body of a girl is found dumped and drained of blood.
Yokas struggles to adjust to her new job and single lifestyle as she tackles her first case; Finney's presence continues to irk Sully, who shares a tragic history with Finney's father.
Davis has his hands full when he is assigned to a brash rookie whose father is head of Internal Affairs; Monroe frets over cooperating in a sting against a fellow officer; Cruz and Miller investigate a Chinese-American gang shooting.
Detective Cruz works fast to fix the crime scene after Yokas guns down an infamous criminal, but a tough new lieutenant (Aidan Quinn) makes it clear she is under his thumb.
When an obsessed mob boss (Gene Simmons) enraged by his son's death continues trying to kill police officers, Cruz begins to wonder whether a fellow cop is helping.
A vengeful father (Gene Simmons) tries to kill as many police officers as he can, including those he holds responsible for the death of his son; Yokas receives startling family news; the new paramedic (Cara Buono) turns heads with her street savvy.
A headless torso leads to grief in the precinct house; Yokas investigates a dysfunctional mother and father (Kate Jackson and Henry Winkler) on possible child abuse charges.
Bosco is suspicious of Martin (Henry Winkler), his brother's defense attorney, and Yokas thinks Martin's daughter may have been abused by his wife (Kate Jackson).
Yokas and Bosco shadow a drug dealer, but their probe clashes with Sgt. Cruz's investigation; a fire breaks out at a crowded rave party, trapping revelers and paramedics.
Officer Monroe accidentally rear-ends another vehicle, causing an explosion that claims a child's life; Cruz's confrontation with a new firefighter intrigues Yokas; Davis takes the LSAT with partner Sullivan.
Cruz searches for Bosco's brother, whom she believes was involved in a cop killing; the fire-department psychiatrist (Susan Dey) tries to win the trust of the paramedics involved in the bloody firehouse incident.
After learning of a turf war between rival Ecstasy dealers, the officers bust an operation headed by a religious sect; a psychiatrist interviews Kim and Carlos and makes some startling evaluations.
A gun-wielding paramedic holds co-workers hostage, as police try to line up a shot; a small-time gangster (Nicholas Turturro) takes Bosco prisoner.
Bosco's anger leads him into a trap set by a mobster; the new fire chief threatens to exile Kim's paramedics; Carlos is suspicious of his brother when he tags along with the paramedics; Doc throws a house party.
Doherty is trapped in an inferno while trying to rescue a sweatshop worker; Monroe tries to prevent the wrong man from confessing to murder and runs afoul of Cruz; Doc frets that a new captain (Paul Michael Glaser) will shut down the station.
Paranoid citizens recoil from real police officers when phony ones go on a rampage; Kim and Doherty agree to keep their romance under wraps; Monroe takes pity on a boy who witnessed his mother's attack.
An anonymous caller alerts police to a wounded man screaming for help in an alley, then a nearby trail of blood leads to a murder probe.
Officer Sullivan rushes into a fiery house to save a 12-year-old; Bosco arrests a store Santa; Carlos avoids a man (Adam Beach) claiming to be his long-lost brother; Doc struggles with loneliness at Christmastime.
Officers Bosco and Monroe intervene to stop a small-time mobster (Nicholas Turturro) from squeezing out an honest businessman; the national press reports on Carlos' search for a bone-marrow match for his daughter.
Cruz and Bosco work with the FBI, which is pursuing the elusive, drug-dealing biker; Doc demands the keys to the emergency bus when he teams up with Carlos; Carlos gets grievous news about his daughter.
Davis faces down the biker-bomber who has been trying to blow up Judge Halsted (Ann-Margret); recuperating Yokas reminisces about what her life was like before she became a police officer.
Officer Sullivan hides a prominent judge (Ann-Margret) in his apartment after a bomb blast threatens her life; Cruz misses a court date to testify against a gang member; Yokas consults a psychiatrist to find the source of her phantom pain.
Officer Sullivan reacts to a suspected bomb blast by pushing a female judge (Ann-Margret) out of the way; Cruz convinces her superior officer to place her under cover again.
Lt. Doherty finds it difficult to earn the men's respect; a rapper's (DMX) subordinates beat up street vendors for selling counterfeit CDs; Yokas experiences friction with her mother (Mia Farrow); Davis weighs returning to his law studies.
Officers give chase when a van speeds past a checkpoint on the Brooklyn Bridge and find it contains illegal immigrants with plaguelike symptoms; Cruz chafes in her new uniform; Bosco gets a new partner.
Guilt-wracked Bosco is unwelcome among his fellow officers; Yokas awakes in the hospital and discovers that she is paralyzed.
Officer Yokas fights for her life after being shot, while her husband seeks retribution; sorrowful Bosco is ready to confess all; a burned firefighter begs Doc to end his life.
Cruz and Bosco are on a collision course with their informant and police ethical standards; firefighter Taylor is chosen to serve as a fill-in paramedic.
Bosco must choose between truth and his partner's desire to find her sister's killer; Yokas focuses on improving her relationship with her troubled daughter.
When Noble (Tom Berenger) is arrested for buying drugs, he cuts a deal by setting up a buy with a notorious dealer.
Kim falls for a famous journalist (Tom Berenger) in the aftermath of an armored car crash; Doc and Kim encounter the woman who accused Carlos of sexual harassment.
When Davis and Bosco bundle Sully off to a cabin to dry out, the self-destructive cop spews lies and hurtful comments.
Firefighters struggle to free an impaled driver and his 18-month-old daughter; Sully's hangover puts his partner at risk; Doc pleads Carlos' case before a paramedic review board.
Phony distress calls keep the police on edge and prevent them from responding to real crimes; Sullivan continues his slide into alcoholism.
Bosco and Cruz are trapped in a fiery methamphetamine laboratory; Yokas recalls meeting partner Bosco for the first time when she was a recruit.
Yokas keeps vigil as her daughter fights for her life after a drug overdose; Bosco accompanies Sgt. Cruz on her mission to find the dealer who sold drugs to her sister.
Yokas' daughter gets trapped with her older boyfriend in a snowdrift after using a drug; Doc risks his career when he puts Carlos back on the street.
A young patient claims Carlos groped her; Yokas encounters a friend when breaking up the domestic dispute of a female couple; Doherty's image is used to advertise an embarrassing product.
Doc breaks in a rookie paramedic (Eve); Carlos is approached by a detective from the Sex Crimes Unit.
A shooter ambushes Bosco, Doc and Carlos as they transport an injured boy (Marc John Jeffries) who is willing to testify against a murderer (Treach).
Bosco's prime suspect (Treach) will get away with murder unless a young boy steps forward to testify; Yokas is paired with Sully, who endangers himself and others; Davis resents chauffeuring the philandering Hancock.
Yokas' shopping spree with her daughter is cut short when they are taken hostage during a bank heist.
Bosco burns to catch an arsonist after failing to save a young mother from a store fire; Davis continues to take heat for chauffeuring a member of the police elite.
Russian gangster Chevchenko (Roy Scheider) shatters Sully's world; a department bigwig (Julian Gamble) wants to designate officer Davis as his limousine driver.
Russian gangster Chevchenko (Roy Scheider) shatters Sully's world; a department bigwig (Julian Gamble) wants to designate officer Davis as his limousine driver.
As a fuel leak expands, Doherty struggles to extricate trapped motorists in a multivehicle collision.
A missing boy's parents incite mob violence against a child molester living in their building; Sullivan agrees to an undercover operation involving his wife.
Bosco chafes under a female unit leader's (Elizabeth Rodriguez) authority while investigating a weapons ring; Sully gleans more information about his wife's sordid past with the Russian mob.
A citywide blackout fuels a rioting mob that traps Officers Davis and Sullivan; Yokas takes risky measures to aid her husband, who is stricken with a heart attack.
During a citywide blackout, Bosco relies on a drug-bust suspect to help with an injured man, while Yokas gets stuck in an elevator with her husband, and a wealthy man offers money to paramedics Doc and Carlos if they will treat him and ignore others.
Taylor learns that her father's body has been recovered from the World Trade Center site eight months after the attack.
Officers Yokas and Bosco help a desperate Dr. Susan Lewis (guest star Sherry Stringfield) search for her missing niece in the conclusion of a crossover episode with "ER.".
Carlos struggles with his prejudice when a white family wants to adopt his daughter; an emergency-room doctor questions Taylor and Kim's every move.
Sully seeks a priest's guidance as he recalls finding a girl's body and encountering a heroic figure who was targeted by a bounty hunter; Doherty thinks of plans for his son's future should he be killed in the line of duty.
Officer Bosco jeopardizes his life and those of others when he ignores symptoms of an emotional breakdown; Carlos feels growing attachment to a newborn even though the child's paternity is undetermined.
Investigators interrogate Sully and Yokas when evidence suggests an officer was killed by friendly fire during a gang shootout; Carlos learns he might be the father of a motherless baby with HIV.
Police sort through the aftermath of a shootout between rival gangs; Yokas tries to interrogate an icy Russian mobster.
A Russian mobster (guest star Roy Scheider) terrorizes Officer Sullivan's nephew, who becomes embroiled in a gang war. Method Man also guest stars.
Doc confronts an old friend (Michael Rispoli) who tricked him into revealing information about a malpractice suit.
Officer Bosco befriends an embittered but wily squad veteran; Carlos learns of Taylor's fling with Officer Davis; Officer Yokas ponders taking the test for sergeant.
Carlos injures himself and must spend a night in a hospital near a hateful patient (Joel Marsh Garland).
Doherty tries to save a boy from a burning apartment; Doc's guilt ties him to a teen who was accidentally paralyzed while in his care.
A camera crew from a TV reality series dogs Doc, trying to turn him into a hero; Bosco isn't aware his partner is suffering debilitating pain from her cancer treatments.
A gas explosion at a diner traps a girl; Sully's wife brings home his mother, who has Alzheimer's disease; Jimmy and Kim face a judge who will decide custody of their son.
While Bosco eludes authorities, Yokas gathers evidence to clear him of suspicion in the murder of a sexual-assault suspect.
Yokas and Bosco get in trouble during a prostitution sweep when a woman claims she was sexually assaulted while officers did nothing.
Doc becomes restless as he ponders his unfulfilled life's path while teaming with Kim to help a heart attack victim.
The squad races to bring a dead woman's heart and a dying girl to the hospital for a transplant, as Yokas tries to cope with the woman's suicide.
In the wake of the Sept. 11 attacks, emergency crews' heroic efforts take physical, mental and spiritual tolls.
Events unfold in the lives of emergency personnel, leading them to moments before the Sept. 11 tragedy.
In an unscripted episode, the cast honors emergency personnel working at the site of the destroyed World Trade Center in New York.
The gang tries to make sense of a gruesome school shooting as they search for victims and try to find the shooter amid the senseless violence.
Yokas rebels after a romantic weekend goes awry by dressing up for a night on the town and befriending an alluring bohemian artist.
After Dr. Morales accepts his marriage proposal, Doc has doubts about moving to Philadelphia where she has been offered a job.
Bosco and Yokas attempt to uncover the source of a heroin batch that is claiming the lives of addicts and users at a terrifying rate.
A firefighter from another precinct uses his competitive nature both on the job and in athletic competitions.
To deal with Bobby's death, the department is enrolled in a stress debriefing class which Carlos uses as a dating opportunity.
Bosco, Yokas and their colleagues search the city for a drug addict who shot one of the paramedics; Kim watches helplessly from the emergency room.
Bobby tries to help out a childhood friend who is now a junkie; Sully is forced to question his new girlfriend's motives for dating him.
Yokas, Bosco, Carlos and an injured Doc realize their only hope of escaping an abandoned basement is a gang of drug runners who may or may not return for a heroin stash.
Internal Affairs investigates Sully after another officer accuses him of manufacturing evidence against a child molester.
Bosco risks his position when he goes after his mother's abusive boyfriend; Sully romances his new neighbor.
A sniper causes frightened officers to reflect on their families; Davis is reminded of his father's death while cradling a wounded officer.
Doc is haunted by the memory of a past event triggered by the return of his high-school girlfriend; Carlos struggles to pass a crucial genetics exam.
Taylor discovers Doherty with another woman at his bachelor party, but when she confides in Bobby, the gossip spreads throughout the firehouse.
While visiting her dysfunctional parents, Yokas realizes the parallels between her own domestic situation and theirs.
After witnessing a horrible car crash involving teenage fatalities, the off-duty paramedics and officers try to erase the tragic memories with a night of boozing.
Davis meets a young woman whose revelations cast a dark shadow over his relationship with Sully and dredge up memories of his late father.
Kim (Kim Raver) hopes to reunite her broken family and must face painful truths about her mother and sister (guest stars Anne Twomey, Marisa Ryan). With Eddie Cibrian.
Doherty returns to work but refuses to admit he may not be ready, even though his performance suggests otherwise.
Doc is angered when the media focuses on the white victim of a robbery in spite of the fact that African-Americans were also wounded.
Yokas ponders her pregnancy while tracking a rapist; Bosco confronts his girlfriend about salacious rumors.
Police race to find a kidnapped man who is buried alive; a lost 4-year-old brings out Bobby's paternal instincts; Carlos befriends a homeless man's cockatoo.
Firefighter Doherty rescues Doc and Carlos from a burning building; the paramedics treat Doherty when he is gravely wounded.
Carlos attempts to rescue a carjacker who crashes during a chase; Bosco attends the opera with his girlfriend and her upscale parents.
Yokas and Bosco search for an abusive husband believed to be responsible for a motel fire; Carlos has trouble with his pregnant girlfriend.
Crews search for a toddler who wandered into the streets after a car accident injured her family; Sully searches for a homeless man who attacked a priest.
Doherty volunteers to climb into the blade chamber of an industrial mixer to rescue a trapped worker; Yokas encounters a successful former classmate.
While standing guard at a political debate between two candidates for the New York Senate, the team argues over work and politics.
Doc tries to aid young gang members who refuse his help; thieves Bosco encountered enter the station to file a complaint; Kim's son breaks a classmate's arm during a fight.
Racial furor ignites when Davis shoots a black man innocently trying to return Sully's dropped gun during an alley scuffle.
On St. Valentine's Day, a mysterious gunman kills several people at a gay wedding; romance blossoms between Doc and Dr. Morales.
A gun battle in the streets yields casualties; Bobby tries to convince his brother to turn himself in.
Yokas fears a mother will file sexual assault charges against a mentally challenged man; Doc wrestles with doubts after hospitalizing his father.
The suicide of a former police friend disturbs Sullivan; an illegally parked car causes a delay in an emergency response.
Doherty and Kim race to free brothers-in-law who are trapped inside a collapsed building; Doc massages a survivor's heart as Carlos rushes them to the hospital.
Kim and Bobby join other paramedics and firefighters in extricating an obese woman from her house; Yokas' husband and his drinking prove to be too much to handle.
Boscorelli is taken hostage during a family feud; Carlos rides Doc for not following up on a woman he tended to at the gym; Bobby tries to bring his mother and brother back together.
Bosco hunts a man suspected of setting a car on fire with a woman locked in the trunk; Carlos strikes a pregnant woman with his rig, which prompts her to begin labor.
Doherty refuses to leave a fast-burning building when a rookie firefighter gets lost in the blaze; Sullivan and Davis track a man who stalks teenage girls.
Yokas hounds a gang member responsible for shooting an 8-year-old boy; Sullivan saves Davis' life while pursuing a suspect.
Officer Davis discovers a decomposed body and encounters a 7-year-old rape victim; Bosco and Yokas try to snag a suicidal jumper.
Doherty's feud with Boscorelli begins to affect others; Davis rescues a woman and child from a submerged car.
Bosco searches an abandoned hotel for a suspect in the shooting of a medic; Sully and Doc train their new partners; Kim and Bobby harp on each other's social life.
Paramedics, firefighters and police officers, overstressed and underappreciated, work the 3 p.m. to midnight shift.