"I had such fuckin' hopes for us." -- McNulty

Frustrated in his grass-roots reform efforts, Colvin arms himself with intelligence from Daniels's detail and personally delivers a message to the next level of corner management. McNulty sees Stringer Bell's legitimate business dealings as a sign that he is now unreachable as a drug target. Bubbles shakes the tree for Johnny one more time.

"Just a gangster, I suppose." -- Avon Barksdale

Stringer Bell gets an education in construction management; Bunk uses shoe-leather to catch up with Omar and deliver a searing message; a frustrated Colvin unleashes the troops on the corner boys, ignoring his new edict; Avon sends Cutty and Slim Charles against Marlo; Bubbles refocuses the picture for Greggs.

"Conscience do cost." -- Butchie

Herc discovers a blast from the past, which he belatedly reveals to his ex-colleagues. Daniels blows a gasket over the real reason the detail was reassigned from an investigation in Pimlico to the Western District. Stringer Bell learns from Donette that she's told Brianna about McNulty's visit and that Brianna is likely to talk to him.

"Crawl, walk, and then run." -- Clay Davis

With Amsterdam running full-tilt, Carver and Truck discover there really is no honor among thieves. Prez impresses the detail with what he's found out from Bodie's cell phone, information that sends McNulty and Greggs on a road trip. Colvin sees the benefits of his plan working but has overlooked the human toll, until the Deacon points out the deficiencies.

"Call it a crisis of leadership." -- Proposition Joe

Brother Mouzone returns to Baltimore on a mission of revenge and casts a wide net in his search for Omar, who has his own plan. Colvin manages, for now, to put off a 'Sun' reporter inquiring about Amsterdam. Carver learns how much he doesn't know about good policing, while Pearlman and Daniels plead their case for a new kind of wiretap to Judge Phelan.

"...we fight on the lie." -- Slim Charles

In the Season Three finale, a reticent Avon readies his troops for a war against Marlo. Meanwhile, as the detail works towards the top rungs of the Barksdale organization, McNulty reassesses his pursuit of Stringer Bell and the path he's chosen for himself. While Royce continues to grapple with Amsterdam, Burrell offers a deal to minimize the fallout.

"Lambs to the slaughter here." - Marcia Donnelly

Four West Baltimore boys wrestle with what to do with the rest of their summer vacation as the new fall school year approaches. Bodie deals with his corner running slower than usual so he decides to take on a runner. Marlo believes he has finally solved the problem that Stringer could never figure out. Freamon, Greggs, and Sydnor go to Pearlman to see if she will issue City Hall subpoenas. Meanwhile, the mayoral race heats up as Mayor Royce and his primary challenger, Tommy Carcetti each hit campaign trail. Prez begins preparing for his new career in higher education, while McNulty ends up turning down a promotion.

"I love the first day, man. Everybody all friendly an' shit." - Namond Brice

Prez is shocked by his students; Royce strikes back against Carcetti; Rawls begins to gut the major case unit from the inside; Colvin embarks on a new career.

"No one wins. One side just loses more slowly." - Prez

Freamon and Greggs move to Homicide, while Herc and Dozerman join Marimow in the lackluster Major Crimes Unit. Cutty gets a "custodial" job at Tilghman School picking up truants, but struggles to make progress while trying to mentor Michael. Bubbles works to get Sherrod back in school as an 8th grader. Burrell finds a way to sabotage the state-witness murder investigation before the election, impacting Greggs. Prez's struggles as a teacher continue while Bodie finds himself working for a new "company". Meanwhile, Colvin pitches his pilot program to the middle school and Carcetti meets with a constituency when he knows that they won't support him regardless of what he says. Randy is faced with a dilemma after being busted for his candy scam and Proposition Joe plays Marlo in a high-stakes heist.

"If you with us, you with us." - Chris Partlow

Commissioner Burrell loses Royce's support; Chris Partlow tries to recruit Michael to become a soldier in Marlo's unit; Dukie shows Randy and the boys that the missing are really dead; Odell Watkins drops his support for Royce and considers an offer from Councilman Carcetti.

Carcetti responds to a campaign smear. Randy is accused of a serious transgression. Colvin's special class gets its first enlistees.

"We got our thing, but it's just part of the big thing." - Zenobia

Prez wants to teach off curriculum. Carcetti visits the Homicide Department and goes on ride-a-longs for drug busts. Colvin and Dr. Parneti's class discuss the Corner Boy rules. Bunk convinces Holley to take another look at the Old Face Andre/Omar Little case. Herc and Dozerman begin shaking down Marlo and his crew as they try to have their surveillance camera returned. Chris Partlow and Snoop look to send the New York crew a message. Marlo asks Proposition Joe to look into Herc. Michael's father comes home, while Namond recruits a lieutenant.

"Might as well dump 'em, get another." - Proposition Joe

Herc and Dozerman search for Little Kevin; Omar gets out of jail; Carcetti has his first meeting with the City Council; Prez and the teachers begin teaching the test; Proposition Joe lets Marlo know Major Crimes is after him; Bubbles looks to Kima and Herc to help him out; Bubbles delivers Little Kevin to Herc; Old Face Andre goes into hiding but Proposition Joe sells him out; Bug's father gets in Michael's face; Michael takes his problems to Marlo; Daniels and Valchek gets promoted; Omar and Renaldo monitor Marlo's activities.

"World goin' one way, people another." -Poot

Walker catches Donut boosting cars and teaches him a lesson; Commissioner Burrell gets advice from Senator Davis; Little Kevin has a talk with Marlo and regrets it; Herc ignores Bubbles call and regrets it; the Area Superintendent questions the success of Colvin and Parenti's project class; Senator Davis attempts to con Carcetti; Carver arrests Namond but keeps him out of baby booking; Burrell has the police force juke the numbers with street sweeps; Marlo puts the word out that Randy is a snitch; Elena sees McNulty as a grown up; Chris Partlow and Snoop target Bug's father for Michael.

"You play in dirt, you get dirty." - McNulty

Randy has trouble with his friends at school, while Carcetti faces a huge dilemma. Meanwhile, Omar visits Proposition Joe, while Freamon reveals a secret.

"That all there is to it?" - Bubbles

While searching for the missing bodies, Freamon goes around the chain of command after being rebuked by Landsman. Carcetti finds that his promises of raises could be undermined by the school debt, forcing him to consider groveling before the Governor for money to pay it off. Colvin tries to keep his experimental class funded. Bubbles considers taking extreme measures to get rid of the man who continues to steal from him. Prez is concerned about Dukie's academic promotion. Omar orchestrates another big sting while Namond and Cutty get a first-hand taste of the "new" Michael. Carver's promise to look out for Randy ends up looking empty.

"If animal trapped call 410-844-6286" - Baltimore, traditional

Burrell tries to help Daniels. Bubbles' big plan backfires and leaves him in big trouble. Colvin tries to find a solution for Namond while Omar makes new plans. McNulty tries to pay back his debt.