Following the shooting death of a police department informant, Aceveda turns up the heat in the investigation of Mackey and his Strike Team.

It's warrant sweep day at the Barn. Vic and the Strike Team discover visiting NBA superstar Derrick Tripp hanging out with his "homies" before the evening game with the Lakers. Vic decides to do his part for the home team by keeping Tripp as a "friendly hostage". One of Vic's street informants, Connie, approaches him after having been roughed up by a new john. Vic hands off the case to Claudette and Dutch, who is convinced they're on the trail of a serial killer. Dutch's theories are proved wrong when he and Claudette ultimately discover that their perp is not a serial killer but rather a disturbed man who is raping women in a desperate attempt to procreate. Danny and Julien stumble upon a gun smuggling ring while delivering one of their warrants and disaster is averted only by Danny's sharp instincts. David has his hands full overseeing the sweep, managing an increasingly packed cage, soothing the frazzled nerves of the attending desk sergeant, and avoiding a potential lawsuit from Derrick Tripp's lawyer over the disappearance of his star client.

A dispute over an up-and-coming singer's success erupts in a gang war that threatens to bring Vic down, too; a case that could help Aceveda's political future sends Dutch and Claudette searching for a missing day laborer.

Mackey must recover the stolen evidence from a drug bust before Aceveda is able to pin the theft on him.

As the Strike Team is reassigned pending the investigation in the theft of evidence, Vic teams with Claudette in order to keep some deadly drugs off the street.

Lemonhead sets out to make things right following his shooting of an unarmed man.

An amputated arm sends Dutch in search of a sadomasochistic killer; Vic sets out to help his old mentor on the force get revenge against the thug whose complaint forced him into retirement.

A murder investigation leads Vic to a massive money-laundering scheme.

The Barn mobilizes to investigate a murderous rampage at a battered women's shelter.

As a new murder investigation exposes Dutch's crisis of confidence, Vic sets out to stop the abuse of a neighbor by her violent boyfriend.

As his own life starts crumbling around him, Vic pitches in to help Dutch in the search for a deadly pedophile.

Vic sets out to stop stolen military weapons from fueling a gang war, unaware that it threatens to expose him as the mastermind behind the theft of the Armenian mob's laundered money.

As Dutch and Claudette continue to pursue a rapist who is targeting elderly women, the arrest of a local gang member threatens to expose the Strike Team's involvement in the money train heist.

Officer Tommy Hisk becomes a prime suspect in the murder of his ex-wife and son.

As missing persons investigation uncovers a graveyard for illegal immigrants working in an illicit drug lab.

A lynching threatens to ignite a race war between Farmington's black and Latino gangs.

As Dutch tries to understand "The Cuddler" rapist, Vic enlists Danny for an important undercover assignment.

As Vic tries to sidetrack the money train investigation, Claudette goes undercover to crack a child porn ring.

As Vic goes after Margos, Claudette risks her career to see that an innocent man is freed from prison.