Lockdown (2006–2010)

1. S01E01GanglandMay 7, 2006—California's Pelican Bay State Prison leads the war on prison gangs.
2. S01E02Predators Behind BarsMay 7, 2006—Ohio's Lebanon Correctional Institution is overfull and behind the times.
3. S01E03Inside Maximum SecurityMay 7, 2006—Oak Park Heights Supermax controls violent prisoners.
4. S01E04Gang WarsDecember 3, 2006—Salinas Valley State Prison in Soledad, Calif.
5. S01E05Women Behind BarsFebruary 11, 2007—California's Valley State Prison deals with violent inmates, overcrowding and heavy drug-trade.
6. S01E06Total ControlFebruary 11, 2007—One of the newest, high-tech maximum security prisons in the United States.
7. S01E07Alexander Correctional InstitutionFebruary 18, 2007—Nearly 2,200 dangerous and conniving criminals.

Season 1 ranked & reviewed

1. S02E01Gang vs. FamilySeptember 9, 2007—The Utah State Prison houses 4,000 dangerous criminals and violent gangs.
2. S02E02NewbiesSeptember 9, 2007—The struggles of prison guard recruits in Wyoming.
3. S02E03Tent CityOctober 28, 2007—Guards use military-like discipline and force to stay in control.
4. S02E04Inmate UniversityOctober 28, 2007—Recruits at the understaffed Wyoming State Penitentiary.
5. S02E05First TimersJanuary 13, 2008—First-time offenders at Iowa's Fort Dodge Correctional Facility.
6. S02E06Iron GripMarch 23, 2008—There's a constant struggle for control inside Alexander Correctional Prison.
7. S02E07County JailJuly 20, 2008—The overcrowded Multnomah County Detention Center may be worse than prison.

Season 2 ranked & reviewed

1. S03E01Surviving StatevilleSeptember 14, 2008—Stateville Correctional Facility is one of America's most perilous prisons.
2. S03E02Life on the OutsideOctober 26, 2008—A convicted armed robber finds his first 90 days on the outside difficult.
3. S03E03Women on the EdgeDecember 10, 2008—Female offenders jailed in Detroit.
4. S03E04Kids Behind BarsJanuary 11, 2009—Colorado's Youthful Offender System.
5. S03E05Alaska Bush Troopers—Alaska Bush Troopers must travel vast distances by airplane, boat and snowmobile to fight crime.
6. S03E06Aryan Brotherhood—In America's maximum-security prisons, they are the most feared inmates. Discover the story of the Aryan Brotherhood, whose reign of violenc

Season 3 ranked & reviewed

1. S04E01Female FelonsJune 14, 2009—The Maryland Correctional Institution for Women.
2. S04E02Sex OffendersJuly 12, 2009—Convicted sex offenders at Fremont Correctional in Colorado.
3. S04E03Bad GirlsMarch 28, 2010—At the Wayne County Jail, officers and counsellors struggle to rehabilitate female offenders, including thieves, drug addicts and prostitute
4. S04E04Kids Behind BarsMay 2, 2010—Colorado's Youthful Offender System aims to break down criminal habits and gang mentalities, from first-time convicts to street-savvy vetera
5. S04E05Shanks and ShakedownsMay 12, 2010—Criminals in Cleveland, Ohio must pass through the Cuyahoga County Jail.
6. S04E06Gang CentralOctober 3, 2010—Inmates in the largest county jail in Denver take advantage of the run down facility.
7. S04E07San Antonio Gang WarDecember 15, 2010—Brutal gang wars rage inside Bexar County Jail; these are the officers in the middle of the war.
8. S04E08Officers Under SiegeDecember 26, 2010—Officers at Hillsborough County Jail in Tampa, Fla. keep inmates safe and under control.
9. S04E09Chaos in CaliforniaDecember 26, 2010—Sacramento County Jail; a couple is charged with torture; a woman's addictions land her in jail.
10. S04E10Blood on the BorderDecember 29, 2010—Violent murders escalate in Juarez, making it the murder capital of Mexico.

Season 4 ranked & reviewed