Now physically recovered, Williams is awaiting approval to return to active duty. Torres and his new partner pose as bikers to solve the double homicide of an informant and her little girl.

Williams and Torres investigate the case of a Wall Street bond salesman who claims to have shot two graffiti artists in self-defense.

A man gets killed by a pit bull which causes Williams and Torres to go into the world of dog betting.

Williams poses as a freshman to investigate a racially motivated killing on a college campus.

Lt. Cooper's daughter ends up missing because of a pedophile she met through email.

A string of robberies leads to an ex-con and his girlfriend. Torres tries to settle a dispute between his father and a mobster.

Williams and Torres pose as a substitute history teacher and a janitor at the high school where a crime was committed.

Moreno poses as a nurse. to solve a newborn's abduction.

Williams poses as a model to investigate the face-slashing of a teen cover girl.

A serial bomber threatens Williams and Torres.

Danny Cort returns with an agenda for Williams to lose his job and his best friend--and to ""smoke [the officer's] little kid.""

Williams is investigated by the internal affairs division for Danny Cort's death (or murder?).

Moreno poses as a prostitute to try to catch a serial killer who Williams wants G to live with him.

After being freed, a policeman's murderer is killed--and the cop's partner is under investigation. Meanwhile, the murderer's girlfriend plots revenge on the gang leader who ordered the officer's death.

Williams and Torres investigate the murder of a free-lance writer. Moreno gets a visit by her missing husband.

Moreno poses as a firefighter in order to find out who's responsible for a female firefighter's death.

Three youths, who were brought from Rwanda to act as mob hit men, are befriended by Father Torres. Moreno gets an inheritance; Williams disagrees with the methods of his son's hockey coach.

When three youths are charged with shooting a couple, one of them insists that, while they robbed the couple, someone else fired the gun.

A hit man's widow wants to become a soldier in the mob and poses as a police officer to kill a fellow crook in Williams's and Torres's precinct.

Lt. Cooper sends two patrol officers to infiltrate a group of corrupt cops When neighborhood dealers starts disappearing.

Williams poses as a member of a militant religious group engaged in an ongoing conflict with a religious sect. Torres's father receives devastating news.

Williams investigate the murder of his son's tutor.

A fight promoter's death leads to a case involving blackmail, murder, and an ex-con whom Williams has helped.

Torres believes the the man who confesses to a killing is taking the blame for his younger brother, who's just received a basketball scholarship to college.

Torres tries to gain the confidence of a gun ring's leader. Williams pretends to be a Jamaican who's prepared to place a substantial firearms order.

A gun-ring leader seeks revenge on Torres.

Harlem churches are targets of bombings. Eddie tries to help Nina recover from her shot wound. Williams has issues with new comer Det. McNamara. G's friendship with a white person is being questioned.

Williams discover that Rev. Harris may be part of the bombings. Nina moves in with Eddie.

Williams befriends a woman whose boyfriend is a leader of a gang that robs apartments. Eddie asks Nina not to go back to work.

A recently released child molester is a suspect of a rape of an eleven year old girl. G is in trouble at school.

Nina and McNamara work together on a case where two robbers are murdered. Nina freezes in battle and decides to turn in her gun. G hangs out with young thieves.

A war happens between east coast and west coast rappers when a california rapper is shot.

Torres's father dies of a drug over dose and Torres believes that it was suicide. Williams tries to get custody of G.

Nina's new undercover case questions her future as a cop.

Toress goes undercover at an AIDS clinic to solve a murder case of a bisexual man. Cooper and Captain O'Bryne start to become closer.

Williams goes undercover as a security guard. McNamara's discovers more of his father's case. Captain O'Bryne confesses his love for Cooper.

Torres and Nina become involved with two feuding Latino gangs.

Lt. Cooper is taken hostage in her office by a man threatening to blow up the precinct if his son is not reprieved from a death-row sentence. Nina learns that the daughter she gave up for adoption 11 years ago wants to meet her.

A thirteen-year-old boy has a videotape of a murder. Torres and Williams try to protect him; The boy's mother turns out to be Williams's old high-school girlfriend, whom he betrayed by sleeping with her best friend, Chantal.

Feds may be part of a drug case and McNamara might lose it all to prove it. Cooper and her husband tell their kids about their separation.

Nina's daughter (whom she gave up for adoption) has been kidnapped and held for ransom.

The detectives have to prove that a Gulf War veteran has stolen missles. Williams meets with G's french teacher about G's crush on her.

Williams discover evidence relating to Martin Luther King Jr's murder.

Nina and McNamara go undercover to find out who tried to kill an executive. Williams and Natasha get close.

A female bounty hunter uses Williams to help find a fugitive in protective custody. Nina and McNamara suspect a wife a recently deceased cop. Natasha visits the precinct.

The detectives suspect a mother of being involved in a carjacking involving her two children. Nina deals with her custody battle for Melissa.

McNamara goes undercover involving a Chinese Mafia that has a link with his father's death. Torres asks his sister for money to buy an engagement ring for Nina.

Williams investigate a case where a girl feel down and elevator shaft in her building. Torres goes shopping for Nina's engagement ring.

Willias go undercover at a prison to find evidence that will catch a drug lord. William's new friend in prison becomes involved in a murder. Torres purposes to Nina.

The detectives go after a bank robbery ring. Torres and Nina get married.

Lt. Barker recruits JC and Moreno to get the armored-car robber who killed Eddie and MacNamara.

Members of the unit target a modeling agent.

Agents interfere in an undercover operation aimed at a Colombian drug kingpin.

Missing teens prompt a probe of a private hospital's organ-donor program.

The detectives go undercover on Wall Street to foil a stock-manipulation scheme.

The unit probes mysterious fires in the garment district.

The detectives discover that the CIA is involved in a money-laundering scheme at a bank in a Cuban neighborhood.

A serial killer gives male victims tainted drugs.

Nell's ex husband comes back and ask's Nell for protection from the mob. Nina and J.C. become close.

Lt. Barker gets involved in a bank robery. G cathes Nina and J.C. in bed together.

Nina and Stone go undercover as owners of a garbage company. Nina and J.C. deal with their emotions of sleeping together and G catching them.

When a woman becomes a fugitive, Nina uses her only resource to help find her, her daughter. Stone's life becomes threatened.

A radical group kidnaps a child for bargaining purposes; Moreno gets even for the death of her husband and her partner when she meets Jordan in prison.