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Lt. Mike Torrello heads up Chicago's Major Crime Unit (MCU) and their man case involves Ray Luca, a young hood about to make his mark on the underworld

Torello realizes that there is a new player that he must bring down.

With Torello's MCU hunting a psychopath, Luca plots jewel heists and the takeover of a sports-gambling operation.

Torello gains a major advantage when one of Luca's burglars is connected to a robbery-homicide of a coin collector's wife. Torello finds out Julie is pregnant.

Mobsters support Luca's nationwide gambling scheme. A publicity-seeking sheriff hampers Torello's arrest of one of Luca's men.

A book intercepted by Torello jeopardizes Luca's nationwide gambling operation. The Torellos meet with tragedy. or... Luca decides to dispense his own brand of justice, while Torello has matrimonial problems to deal with

Attorney Abrams falls for a reporter helping him defend a tenant accused of assaulting a slum landlord. or... A man is cleared of assault, but when he is evicted he accidentally kills his landlord and all the evidence points to murder

Conflict ruins the Torello's weekend trip. Luca situates in Las Vegas. Bigots target Abrams's relationship with Susan. or... Mike's attempt to save his marriage fails, and he leaves his wife; the FBI bungle the arrest of a gangster who could lead them to Luca; and the mob get a friend of Torello's promoted to the pension board.

Torello confronts his new friend, now laundering money for the Mob. Federal investigators indict Luca and Bartoli. or... Kehoe is horrified when he learns of Marilyn Stewart's death and puts himself in peril by confronting Luca about the murder

Devastated by Kehoe's death, Torello stonewalls Breitel's federal investigation. Abrams joins the MCU on the street. or... Susanne puts herself at risk when she investigates the source behind a new type of heroin that has caused several deaths in the ghetto.

Divorced Torello finds comfort with Inger. The Crime Unit nabs Luca's jewelry-heist team. Torello's best friend supplies the Mob with capital.

This episode is a review of the season up to that point with new footage added at the end of the episode.

Indelli and Krychek must deal with a tense hostage situation. Torello travels to Indiana to make his move on Frank Holman. or... A woman is held at gunpoint in a hotel, forcing Torello to discuss the FBI's interest in the man with David Abrams

Holman ideintifies Torello as a dirty cop to Breitel. After an attempt on his life, Luca takes refuge in Florida. or.. Ray Luca is the target of an assassination attempt.

Torello is subpoenaed to testify for Luca. An enraged Abrams jumps to Torello's defense. Luca orders Torello and Abrams killed. or.. Torello is accused of being involved with organised crime and using the Chicago police force as a cover.

Breitel brutally cross-examines Torello. Acquitted Luca moves to Las Vegas. Torello gets a new assignment. or... Torello faces a gruelling cross-examination in court to defend himself against the bogus charges of corruption levelled at him by Holman

Torello and Krychek join the Federal Task Force planning to raid Luca's new gambling business in Las Vegas. or... Torello and Krychek leave Chicago and drive to Vegas where they attempt to bring Al, a collector for a juice operation, to justice.

To take over Las Vegas casinos, Luca murders the head of a resort-workers union to put his own man in the position. or... A date with a pretty woman turns into a nightmare for Torello when a bomb is thrown through the window of the restaurant where the couple are enjoying a romantic meal.

Torello falls in love with a Justice Attorney's former wife, only to find out that the attorney has been molesting his adopted daughter. Molestation charges jeopardizes the Unit's investigation of Luca. or... Cori Luca pays a visit to Ray's casino. Meanwhile, Federal Agent Jack Claymore plans an evening of fun with Taglia

Luca's greedy ploy to take over another casino puts his entire gambling empire in jeopardy. or... Claymore, having infiltrated Luca's organization, meets Torello, Krychek and Abrams at an abandoned mine in the middle of the desert.

Luca's jubilation over his growing business turns to fear that his associates are setting him up. Luca's insatiable lust for violence proves his undoing when he rapes Pauli's girlfriend. Pauli testifies for the prosecution in Luca's trial. or... During a wild party at Luca's estate to celebrate the takeover of a fifth casino, Goldman begins singing the praises of his best friend