Nyla remains suspicious of Liam Glasser as a wildfire erupts, causing chaos in the city. Meanwhile, James tries to help a friend, and Seth makes a costly mistake, putting two of their own in danger.

An April Fools' prank on LAPD’s social media leads to citywide chaos. Meanwhile, John's T.O. skills are tested, Wesley is assigned a challenging case, and Tim and Lucy play a joke on the team.

John and Celina find themselves in a hostage situation while undercover for a public safety initiative. While Angela and Nyla investigate the suspects, Tim challenges Lucy’s decision-making skills.

The team searches for a serial killer as Nyla struggles with the aftermath following the attack. Lucy’s relationship with Seth takes a turn, while Bailey battles her fear of Jason Wyler.

John, Lucy and Angela investigate the suspicious stabbing of three teenage girls. Back at the station, the team experiences technical difficulties while managing a group of prisoners and a wild animal.

Ahead of Bailey's return home, John looks for clues to locate Jason Wyler. Then, Tim and Lucy swap rookies; a friendly face resurfaces at the station, and Wesley feels unsettled over Angela.

It’s Valentine’s Day, and Lieutenant Grey gives Tim and Lucy an unromantic assignment, while John and Celina track down a missing girl. Later, the team sharpens up for a charity gala where multiple relationships come to a head.

Following his stint at the LAPD, Wesley returns to the district attorney's office where his past connects him to the team's investigation. Meanwhile, Bailey and John have conflicting feelings over safety, while Lucy grows suspicious of Seth.

On Celina's last day as a rookie, John gives her one final test. Meanwhile, Bailey makes a new friend, and Lucy places her faith in Seth for an undercover assignment.

The team mobilizes to locate a suspect after a deadly series of events affects one of their own. Meanwhile, Celina takes on her first case with Bailey's help.

When anti-LAPD billboards emerge throughout the city, the team searches for who's responsible. Meanwhile, a car bombing prompts an investigation, Miles reconnects with an old friend, and John and Bailey assess their ability to adopt.

Now recovering from a gunshot wound and feeling the effects of his age, John and the team welcome two new rookies and continue the hunt for two dangerous inmates with very personal vendettas following their prison escape.

Officer Nolan gets a lesson in respect after his arrest of a gang member leads to a free-for-all on his life. Meanwhile, Officer Chen and Officer Bradford pull over Mario Lopez, who thinks he can talk his way out of a traffic violation.

After one of their own is shot, the team suffers a series of close calls and realizes their division may be a target for a group of masked assailants.

The team is tasked with community policing while hunting for a local vigilante. Meanwhile, Celina’s instincts are tested, and Tim and Lucy discover secrets about the two new rookies.

Officer Nolan and the entire team are in a desperate search to rescue Officer Chen after her abduction and must attempt to get Rosalind to help them in their search. Meanwhile, after Officer Lopez discovers Wesley unconscious from a dangerous cocktail of alcohol and pills, she is forced to keep him close by.

Nolan and Bishop respond to a silent alarm call at a local convenience store where two men are attempting to rob the place. Bishop helps coordinate a drug bust that hits a little too close to home for Bradford.

Officer Nolan and team are charged with escorting a notorious female serial killer to the graves of her previously unrecovered victims. However, when they arrive, they unearth even more than they expected. Meanwhile, Officer Chen meets a seemingly perfect man who sparks her interest, and Officer Lopez worries about Wesley as his PTSD continues to increase.

Officer Bradford’s wife, Isabel, is found shot but alive and he vows to track down the man responsible. Meanwhile, Officer Nolan must protect his home and the truth after a home invasion attack.

As the rookies prepare for a big exam to see who moves on to the next stage of training, Officer Nolan and Officer Bishop are called to the scene of a murder and learn that the victim may be tied to a potential terrorist attack on the city of Los Angeles.

When a prison bus crashes, all units must respond as some inmates face severe injuries while others seek an opportunity to flee. In the wake of the accident, Officer Nolan tries to impress an FBI hostage negotiator while tracking down an escaped convict.

Officer Nolan kicks off his birthday by babysitting a crime scene at a law office. Meanwhile, Officer Bradford and Officer West are set to receive special awards, and Sgt. Grey rides patrol with Officer Harper after she requests an early annual evaluation.

Their rookie year is coming to an end and officers Nolan, Chen and West are about to be squeezed harder than ever before as their training officers evaluate whether they are truly ready for the job. Meanwhile, after one of their rookie classmates is involved in a shooting, the team uncovers some unsettling evidence .

Officer Nolan and team are on a hunt to retrieve a buried stash of gold before any treasure seekers get hurt. Meanwhile, Bradford is tasked with encouraging the oldest cop at the station to retire and invites him to ride with him.

In the aftermath of the assaults in the explosive season five finale, the team must now try to understand why they were targeted and if there is a bigger plan in place. Meanwhile, Nolan must survive his last shift before his wedding to Bailey.