Sheriff Jamey Noel sends seven volunteer civilians into jail to serve as undercover inmates.

Six months after the completion of an unprecedented program in Clark County Jail, all seven participants have returned to their lives unalterably changed.

Newly elected sheriff Mark Lamb sends six volunteers into the Pinal County Detention Center on a mission to uncover valuable intelligence about the gangs, drugs and operational issues that plague his facility.

With three participants in the jail and two more on their way in, Sheriff Lamb's mission-based program is off to the races.

With all seven participants embedded in the facility, some struggle to maintain their distance from one another; one participant threatens to bring the whole program to an abrupt end.

As the participants begin to focus on their missions, some find early success while others are met with immediate interference; Sheriff Lamb is forced to make a tough decision.

The participants are tested by thieves and the racial politics of jail, forcing them to become either targets and victims, or threats and aggressors.

David climbs the ranks in the pod and struggles to remember what side he is on; Abner is tested when one of his own commits an offense; the women suspect that they are being unfairly targeted by the DOs.

More than halfway through their time in jail, the participants struggle to make progress on their missions; as pod drama boils over, some hit their breaking point.

The participants struggle with race politics, jailhouse thieves, and protecting their cover stories; the secrets become too difficult for one participant to keep.

The sheriff and his team face a tough decision; the consequences of one participant's actions put the remaining participants in very real danger.

When a participant's cover is blown, Sheriff Lamb and his team must decide whether to end the program early or risk the lives of the remaining participants.

For the first time, all seven participants will meet with the Sheriff and his team to discuss the craziest moments from their time in the Pinal County Jail.

After the remaining participant leaves the program, the Sheriff and her staff process how to implement the feedback as the inmates continue serving their time.

The participants have left the program, cameras remain to document changes being implemented throughout Pitt County Detention Center, and the raid expands to the men's unit which takes the inmates by surprise.

In part one of the season 8 reunion, sparks fly and tempers flare as host Mona Scott-Young grills the original six participants, who reunite with Sheriff Dance and Chief Capehart for the first time since leaving the 60 Days In program.

With the end of the program drawing near, the participants struggle to tie up loose ends, fend off suspicion, and face real problems in the jail.

After the remaining participants are released, they meet with Sheriff Smith and his team to discuss their time inside the Utah County Jail and find out which team members finished the program.

Now that all the participants have left, they sit down with the Sheriff and his team to reflect on necessary changes they hope will be made at the Utah County Jail.

For nine gripping seasons, "60 Days In" has sent brave participants undercover in some of America's most dangerous jails. We are counting down the top 50 participants to ever get locked up for the "60 Days In" program!

The final participant enters the experiment and Isaiah and Zac fears their covers have been blown; Zac searches for illegal drug use in C-pod; and Tami clashes with another inmate.

Undercover program is put as risk when Jeff is attacked.; Zac and Isaiah move to the D-pod wing and Robert returns to general population. Tami's wife makes a surprise visit and Barbara feels betrayed.

Three more participants enter general population as Corey's dental distress sends him over the edge.

The team struggles to adapt to life inside and as the final participant enters the jail, the pact is already broken.

The desolate reality of jail continues to challenge the team, causing a second participant to give the emergency signal.