Abrams (Stephen Lang) is faced with a life-and-death decision when Luca (Anthony Denison) plans to murder Torello (Dennis Farina).
Luca attempts to trap Torello by setting an execution date for Krychek who is imprisoned in a Latin American country.
Torello (Dennis Farina) and the Strike Force travel to Latin America to bring Luca (Anthony Denison) back to the United States.
Torello locks horns with Luca during a Senate hearing after failing to link him to government officials.
Torello's (Dennis Farina) hard-drinking reporter friend (Tom Signorelli) comes to Las Vegas to expose Luca's (Anthony Denison) drug-smuggling cartel.
The strike force gets drawn into a brothel war when Nate helps a business pal battle unfair competition.
Torello's routine assignment to retrieve an escaped convict becomes a fight for survival when killers join the search.
Luca (Anthony Denison) is injured in an atomic blast and Taglia (John Santucci) must find an escape route for them from a government hospital.
Luca goes to extremes to keep Weisbord alive, including making him the first heart-transplant recipient.
In return for the man's testimony, Torello offers government protection to a Chicago mobster with a contract on his life.
A Chinese agent dupes Torello into looking for her father, while she smuggles plutonium out of the country.
Torello can't identify the source of a money-laundering operation; Clemmons reveals his suspicions about Iris' new casino partner.
A new nightclub is the target of fire bombings, extortion and racial threats; guests Dexter Gordon, Margaret Avery.
A defecting Soviet pilot becomes custody of the strike force, which learns of plans to use him in a spy swap.
Luca falls for an actress in a movie he is financing, and discovers she also uses people.
Torello, looking for a murder witness, and Luca, searching for Weisbord's granddaughter, each search for a missing girl.
Danny Krychek (Bill Smitrovich) is gunned down by a powerful Chicago thug (John Michael Bolger) planning a major Las Vegas casino robbery.
Luca returns to Las Vegas after being granted immunity, causing revenge-minded Abrams to resign in frustration.
Torello follows a crazed killer into Mexico, unaware his quarry will lead him to an arms-for-drugs operation run by Luca.
Indelli discovers his high-school flame is a Las Vegas prostitute and enlists Mike to save her from a pimp.
Torello confronts his feelings for his ex-wife when she asks him to rescue her kidnapped husband (David Soul).
An overzealous senator outrages crime bosses by subpoenaing them to appear before an organized crime commission.
After his murder mistrial, Luca clashes with a crime kingpin over plans to split up control of the sinking Luca gambling empire.
Empire builder Luca's jubilation over his growing business turns to fear that his associates are setting him up.
Luca's determination to add another casino to his gambling organization brings his empire to the brink of collapse.
A child molestation charge against one of Torello's colleagues jeopardizes the unit's investigation of Luca.
To take over Las Vegas casinos, Luca murders the head of a resort-workers union to put his own man in the position.
Torello and Krychek join the strike force planning to raid Luca's burgeoning gambling business in Las Vegas.
Breitel brutally cross-examines Torello; acquitted Luca moves to Las Vegas; Torello gets a new assignment.
Torello is subpoenaed to testify for Luca; enraged Abrams jumps to Torello's defense; Luca orders Torello and Abrams killed.
Holman identifies Torello as a dirty cop to Breitel; after an attempt on his life, Luca takes refuge in Florida.
Indelli and Krychek must deal with a tense hostage situation; Torello travels to Indiana to make his move on Frank Holman.
Obsessed Torello takes his fight against Luca all the way to the grand jury.
Divorced Torello finds comfort with Inger; the crime unit nabs Luca's jewelry-heist team; Torello's best friend supplies the mob with capital.
Devastated by Kehoe's death, Torello stonewalls Breitel's federal investigation; Abrams joins the MCU on the street.
Torello confronts his old friend, now laundering money for the mob; federal investigators indict Luca and Bartoli.
Conflict ruins the Torellos' weekend away; Luca situates in Las Vegas; bigots target Abrams' relationship with Susan Terry.
Attorney Abrams falls for a reporter (Pam Grier) helping him defend a tenant accused of assaulting a slum landlord.
A book intercepted by Torello jeopardizes Luca's nationwide gambling operation; the Torellos meet with tragedy.
Mobsters support Luca's nationwide gambling scheme; a publicity-seeking sheriff hampers Torello's arrest of one of Luca's men.
As Torello basks in the happiness of his wife's pregnancy, his crime unit makes a break in the investigation of Ray Luca's "home invader" robbery team.
With Torello's unit hunting a psychopath, Luca plots jewel heists and the takeover of a sports-gambling operation.
Lt. Mike Torrello, head of Chicago's Major Crime Unit tries to take down Chicago Mobsters, while Ray Luca, is making his mark as in Chicago's underworld.