Police officer Vic Mackey and the Los Angeles Police Department attempt to rid the city of crime, using their own unconventional, and often illegal, methods.
Aceveda tries to fend off a city council investigation, and Vic looks to stop a pair of brutal drug lords from moving into Farmington.
An arson attack on a local drug dealer threatens to expose Vic's protection racket.
An amputated arm sends Dutch in search of a sadomasochistic killer, and Vic sets out to help his old mentor on the force get revenge on a thug who forced him into retirement.
A murder investigation leads Vic to a massive money-laundering scheme.
Elementary school drug dealing prompts Vic to redouble his efforts to bring down a ruthless new supplier.
The Barn mobilises to investigate a murderous rampage at a battered women's shelter.
A new murder investigation exposes Dutch's crisis of confidence, and Vic sets out to stop the abuse of a neighbour by her violent boyfriend.
Vic and the team set their sights on taking Armadillo off the streets for good.
In a look back at the Barn's early days, Vic struggles to secure his hold on the team while Dutch is faced with choosing between a veteran detective and Claudette.
A leak of an auditor's report jeopardises the futures of everyone at the Farm.
Vic mobilises the team to help Aceveda's election campaign, and Dutch and Claudette suspect that a teenage girl is lying about a rape accusation that she has made.
As his own life starts to crumble around him, Vic pitches in to help Dutch in the search for a deadly child sex abuser.
As he struggles to keep his job, Vic pushes ahead with a new plan to hijack an Armenian mob money shipment.