Sgt. Grey helps the team prepare for their biggest mission yet. Meanwhile, Aaron, Lopez, Celina, Tim and Smitty discover a surprising connection in their case.

Officer Nolan and Celina take on a special case; meanwhile, Monica enlists help to identify her attackers. Elsewhere, Lopez and Harper discover a connection to the trail of crimes.

After a mafia-related mass casualty, the team is tasked to keep the peace at the hospital. Lucy and Celina work together to investigate the suspects behind the attack. Meanwhile, Tim and Aaron embark on a metro ops mission.

When two teenagers go missing, it is up to the entire team to find the girls and uncover the truth about their disappearance. Meanwhile, Lopez and Harper are on a different kind of investigation – the search for the perfect nanny.

Following their time as foster parents, Bailey has decided she wants to have a baby and forces John to reconsider their decision to not have children. Meanwhile, John and Celina discover a prison escapee whom they fear is out for revenge and race to find

When a toddler is found at the scene of a crime, John and Bailey must decide whether to let the child go to a shelter for the night or care for her themselves. Meanwhile, when someone from his past returns, Tim disappears and leaves Lucy in the dark.

It's Officer Aaron Thorsen's first day back since the assault, and he's tasked with a series of high-stress cases to determine whether he's ready to work. Elsewhere, the team investigates a homicide case with a potential tie to the pentagram killer.

Nolan and Bailey's honeymoon is more of a nightmare than dream when it turns into an active crime scene. Meanwhile, Tim and Celina partner up and must uncover the identity of a John Doe.

The team comes together to celebrate John and Bailey's wedding; meanwhile, Celina discovers a discrepancy in her case, leading to a new discovery. Elsewhere, Lucy and Tim's relationship is put to the test.

The team must try to understand why they were targeted and if there is a bigger plan in place; Nolan must survive his last shift before his wedding to Bailey.

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.

Officer Lucy Chen goes undercover to infiltrate an illegal firearm operation, and Detective Harper and Officer John Nolan work together to solve a mystery involving severed limbs found around the city.

Officer Tim Bradford's ex-wife returns and asks the team to help her save someone from her undercover past. Isabel's return also creates additional pressure in Lucy and Tim's relationship as they assist in the search.

A life-altering incident inspires a small-town guy to pursue his dream of becoming an officer with the Los Angeles Police Department.

When Dim goes missing, Officer Chen and Sergeant Bradford, along with the CIA, set out to find him and enlist the help of Juicy.

Now that Elijah and Abril have become allies, the team must rely on Monica, Elijah's lawyer, to uncover their plans; Officers Nolan and Juarez reopen her sister's case and discover a discrepancy that leads them on a new trail. 

The team must stop a militia from detonating a highly combustible truck in their possession; Nolan, Thorson, Juarez and Harper search for three men who may have been exposed to Ebola.

With help from the FBI, Lopez puts everything on the line to help Elijah Stone take down a gang leader in exchange for her safety; Nolan and Bailey must deal with the secrets and shady dealings his late mother left behind.

Officer John Nolan and Bailey are on the hunt for a mystery gunman after a shooting hits a little too close to home. Meanwhile, Aaron struggles to live within his means and joins Lucy to help Tamara when the mother of a child she babysits goes missing. El

In the midst of a heatwave and a citywide blackout, Officer John Nolan and Aaron follow increasingly large leads after they discover criminals hiding at the station. While on duty, Officer Chen makes an alarming discovery after being called to a scene whe

Officer John Nolan and Celina are enlisted to stand guard at a hospital after a dangerous prisoner must have surgery and they suspect there's more to it than meets the eye. Meanwhile, Aaron gets Lopez and Harper to help him investigate a string of home ro

The search for a missing boy leads the team into the middle of a dangerous drug war between two rival gangs 

Detective Nyla Harper and James find themselves in the middle of a bank robbery which leads the entire team on a citywide manhunt. Meanwhile, Tim and Lucy finally go on their first date, but it does have a few complications. 

Officer John Nolan and the team investigate the unexpected death of a suspect in police custody. Their search also uncovers a very delicate loose end that could jeopardize Officer Celina Juarez's career. Meanwhile, Sergeant Grey and his wife, Luna, go to

Officers John Nolan and Celina Juarez are in a race against time to stop the source of an explosive rampage. 

Officer John Nolan and Celina witness a shooting, realize the victim was already dead, and investigate further. Back at home, Bailey has been feeling off-center ever since the proposal, leaving Nolan to wonder what he can do to make her feel more comforta

Officer John Nolan and a sleep-deprived Celina investigate a cash deposit linked to an old DEA case. Meanwhile, Wesley grows increasingly concerned about his deposition and is shocked when he realizes Elijah's attorney is a familiar face from his past.

Officer John Nolan and Officer Celina Juarez are on the hunt for a fugitive after a car incident goes awry. Meanwhile, a past injury comes to haunt Tim and Lucy comes through during his time in need in more ways than one.

Rosalind returns with a vengeance and Bailey's life is left hanging in the balance. With a ticking clock, the LAPD and the FBI join forces, and Officer John Nolan is forced to make a deadly decision after a harrowing ultimatum.

Officer John Nolan is assigned his first rookie, Officer Celina Juarez, whose unconventional approach to police work poses a unique challenge for him.

Officer John Nolan is moving closer to his new role as a training officer. Meanwhile, Lucy's successful undercover assignment earns her an invitation for specialized training in Sacramento.

Officer John Nolan is once again face-to-face with serial killer Rosalind, and she wants him to know she's not done with him yet. Meanwhile, officers Bradford and Chen work undercover with Detective Lopez and the Las Vegas Police Department to arrest lead

Officer John Nolan is forced to spend a week in solitary confinement in a quiet border town with a young local officer who is in need of some training. Meanwhile, Sergeant Bradford and Officer Chen discover that looks are deceiving and go undercover toget

Sergeant Grey supports Officer Nolan's desire to become a training officer and offers to ride with him for the day to get him ready. Meanwhile, Tim and Lucy must manage expectations in their respective relationships as they decide on their plans for Mothe

The team alongside the LA Division of the FBI are in a race to stop bombs that have been scattered throughout the city by a suspected terrorist. Meanwhile, the joint task force is suspicious of the CIA's involvement in the situation.

Officer Nolan and the LA division of the FBI enlist the help of FBI trainee Simone Clark when one of her former students is suspected of terrorism following an explosion at a local power station.

After the robbery of a train filled with valuable auction items turns deadly, the team is called to investigate. Meanwhile, Officer Chen has doubts about being Sergeant Bradford's aid and is upset when he doesn't give her the recognition she deserves. Els

Officer John Nolan and the team feel they must negotiate with a distraught man who is holding a hospital hostage to ensure his wife receives a lifesaving surgery.

Officers John Nolan and Lucy Chen must fulfill three quests if they want to get a stolen police helicopter back safely from a teenage thief. Meanwhile, Officer Nyla Harper and Aaron Thorson must guard a convicted cop killer in the hospital following a pri

The team responds to the report of a severed hand washing up on the beach and are on the hunt to find its owner. Meanwhile, Tim attempts to prove he isn't a control freak to Lucy and invites her on a double date with him and Ashley.

The team must rely on a criminal for his expertise to help take down an even bigger threat. Meanwhile, Officers Chen and Bradford investigate the murder of an unhoused teenager who used to be friends with Tamara.

Now that John Nolan knows about Bailey's past, he must decide if they still have a future. Meanwhile, when a plane crashes in the middle of the city the team races to find out why.

Desperate to break free from his connection to Elijah, Wesley tries to plant a listening device in his office to incriminate him. Meanwhile, Officer Bradford and his sister, Genny, learn an unsettling truth about their father.

The team goes on a city-wide hunt for an individual who is threatening a mass casualty event. Meanwhile, Tim's sister Genny shows up unannounced with some surprising news, and Lopez continues her inner struggle over Wesley's deal with Elijah and tries to

In the aftermath of Fred's house explosion, Officer Nolan and Bailey discover there's more to Fred's death than meets the eye. Meanwhile, Officer Chen and Officer Bradford demand a treasure hunt rematch and enlist Officer Grey to help set the terms to a n

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.

When a new designer drug hits LA streets, it turns users into "zombies," and Officer Nolan and the team have a Halloween they won't soon forget. Back at home, Lucy questions whether her apartment building might be haunted.

Officer Nolan and Officer Chen search for a missing person who may have international ties that puts everyone's lives in danger. Meanwhile, Harper continues the search for a serial arsonist after responding to a report of an injured cyclist. Elsewhere, We

Officer Nolan and officer Chen report to a structure fire and suspect that there is more to the situation than meets the eye. Meanwhile, after witnessing a sniper shooting, the team searches for the shooter and discovers that the perpetrator has a connect

Officer Nolan and Officer Chen's run-in with an infamous thief tips them off to a potentially big heist surrounding the Getty's big gala event. Meanwhile, Nolan works up the courage to ask Bailey out on date.

Officer Nolan and the entire team race against the clock to locate Lopez after she is kidnapped on her wedding day, not only to save her life but her unborn child's.

Officer Nolan mildly injures himself while chasing down a shoplifter and the local DA wants to charge the suspect with assault despite Nolan's wishes. Meanwhile, Lucy goes undercover, Lopez' wedding venue is seized by the FBI and Nolan meets his new neigh

Officers Nolan and Bradford hope they can de-escalate a drug war before any innocent lives are lost. Meanwhile, Officer Harper hopes she can get Officer Chen ready to go undercover.

After rushing his son, Henry, to the hospital following his collapse, Nolan is reunited with his ex-wife, Sarah, and they must come together to help their son. Meanwhile, Detective Lopez discovers "La Fiera" is in the same hospital and wants to find out e

When Professor Fiona Ryan's car window is smashed following a series of mysterious notes, Officer Nolan volunteers to guard her house overnight. Meanwhile, Lucy notices that Tim is being much nicer to his new boot than he was with her and she does not lik

Officers Harper and Nolan respond to a bank robbery in progress and realize the motives of the thief run much deeper than just needing money. Meanwhile, Officers Jackson and Chen's first day riding without training officers isn't what they thought it woul

An Amber Alert sends the team on a race against time to find a newborn infant who was stolen from a local hospital. Meanwhile, Officers Jackson and Chen work their last shift as rookies as Officer Nolan continues on for 30 more days.

Officer Nolan, Officer Harper and Detective Lopez are assigned to the kidnapping of the son of a criminal court judge who has a long list of enemies who could possibly be involved.

The team gets the true crime docuseries treatment when they analyze a recent case featuring a former child actor whose adult life has garnered him a cult following.

Officer Nolan's decision to return to school in order to become a training officer is proving to be much harder than he expected. Meanwhile, Officer Chen considers going into undercover work after getting a taste of the job when Harper's former colleague

Officer Nolan is taken hostage by a man with nothing to lose while the station goes on lockdown and races to identify the suspect before time runs out. Meanwhile, Officer Jackson and his training officer, Officer Doug Stanton, reach a tipping point in the

Officer Jackson West's relationship with his new training officer, Stanton, has escalated and he begins to work with Sergeant Grey to find a solution.

Officer John Nolan's mom makes an unannounced visit that complicates his life, and Sergeant Grey considers retiring.

Officer John Nolan and Officer Nyla Harper are assigned to a community policing center to help rebuild their station's reputation in the community. Nolan is determined to make a positive impact but Nyla has her doubts.

Nearing the end of his training, Nolan now faces his biggest challenge as a police officer yet when he must come to terms with the choices he has made in pursuit of the truth.

In part two of the season finale, Nolan's discovery goes much deeper than he expected and could put his life and career in jeopardy.

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 invol

Nolan and Harper are tasked with escorting 4 juvenile offenders to a Scared Straight program at a correctional facility that quickly becomes a riotous situation. Nolan is uncertain about his relationship with Grace after she fails to introduce him to her

Officer Nolan's relationship with his first confidential informant is tested when he discovers her back on the street dealing drugs. Meanwhile, Lucy's fear of dating following her abduction and her intrusion into Jackson's relationship is beginning to thr

Officers Chen and Bradford respond to a call at the Los Angeles auditions of "American Idol," and Officer Chen ends up facing Ryan Seacrest and the judges. Meanwhile, Chen befriends reporter whose motives are not clear. 

Officer Nolan is having a particularly bad day after learning his identity has been stolen and could jeopardize his position as an officer. Meanwhile, Sgt. Grey must confront his past and testify at the parole hearing of the man who shot Grey and murdered

Officers Nolan and Harper investigate a murder which may have national security implications, while Officer Bradford must confront his past when he crosses paths with a homeless veteran.

Nolan is given some life-changing news and invites Grace over for a homecooked meal in his newly remodeled kitchen. Meanwhile, each unit is tasked with following up on dormant cases in the hopes they can uncover new leads.

Lucy returns to duty after her abduction and Harper steps in to help her through her first day back on patrol. Meanwhile, Nolan takes his son's fiancé, Abigail, on a ride along after showing interest in becoming a police officer.

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

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

Officer Nolan's trust is tested when he tries to help the previous owner of his home reconnect with his family. Meanwhile, Officer Harper has finally earned an overnight visit with her daughter that is put into jeopardy when her past undercover life resu

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

John and Jessica's relationship gets a lot more complicated after she delivers some surprising news. Meanwhile, Officer Bradford and Office West are assigned a community policing project helping out the Watts Rams as volunteer coaches at their fall clinic

An emergency alert of an impending missile attack sends Los Angeles into chaos and uncertainty, while the officers each try to keep the peace and deal with their own disasters.

As part of their second phase of training, the rookies are asked to develop their first confidential informants. Officer Nolan soon discovers that no two informants are the same and struggles with his newest task. Meanwhile, Officer Chen's mother complica

Officer Nolan gets off to a rocky start after being introduced to his new training officer, Nyla Harper, who has an unconventional approach to police work after her stint as an undercover detective. Meanwhile, Officer Bradford struggles to think of an app

Officer Nolan navigates building tension in his relationship with Jessica and a developing rapport with Grace while working a high-stakes criminal case involving an undercover homeland security agent. Meanwhile, Officer Chen meddles with Officer Bradford'

Nolan teams up with new night detective Pablo Armstrong for a murder investigation case that results in an unexpected reunion with a former love interest. Meanwhile, Officer Bradford reluctantly accepts help from Officer Chen as he prepares for his sergea

Danger is ever-present as the officers of the Mid-Wilshire precinct grapple with the aftermath of a plotted attack on the city of Los Angeles, leaving Officer Bradford fighting for his life. Flash forward two weeks and the rookies receive the shocking res

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.

Sergeant Gray informs the rookies that they must track down a specific set of crimes in a 48-hour period in order to qualify for their final exam. Meanwhile, Officer Nolan and Officer Bishop answer a silent alarm call at will.i.am's house.

When one of their colleagues is arrested by Internal Affairs for lying on the witness stand, it leads to the release of three felons whose cases he worked on and the team being asked to check in on them now that they are free. Meanwhile, Officer Nolan fin

A massive earthquake rocks the city and throws everyone's patrols and its citizens into chaos. Meanwhile, agent Russo recommends Officer Nolan for a protective detail of Brad Hayes, a man whose dealings have put a target on his head.

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.

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.

The rookies are really put to the test when their training officers accompany them out of uniform for Plain Clothes Day, which forces them to make all the decisions while on patrol. Meanwhile, Officer Nolan tries to prove he has been progressing faster th

The rookies become the prime suspects after it is discovered a large sum of money used in a drug bust has gone missing.

The most dangerous day of the year - Valentine's Day - has the team on high alert, and Officer Nolan invites everyone over for a party now that he is single.

An unscheduled visit by the vice president of the United States puts the station on high alert. The secret service tasks Officer Nolan and Officer Bishop with checking out a possible threat to the vice president while the rest of the team try to keep the

On Captain Andersen's orders, Officer Nolan and Sergeant Grey are paired up for the day on patrol. Additionally, Nolan's son and Grey's daughter visit their dads on the job and see them in action. Meanwhile, Officer Chen is paired up with Captain Andersen

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.

Officer Nolan and Officer Bishop respond to a silent alarm call at a local convenience store where two men are attempting to rob the place. Officer Nolan pursues one of the suspects on foot and is forced to make a split-second decision that will affect bo

Sergeant Grey informs Officer Nolan and Officer Bishop that they are going to have a movie director as a ride-along during their patrol after a fun afternoon granting the wish of a Make-A-Wish kid as honorary police officer Kaydence Patton. Meanwhile, Off

Nolan and the team must help capture a cop and his former mentor from the academy after he becomes a fugitive following an assault. Meanwhile, Officer Tim Bradford needs Officer Lucy Chen to learn to predict the moves of criminals in order to capture them

Nolan, the rookies and their training officers get involved in a competition that pits them against each other, while Officer Lucy Chen notices Officer Tim Bradford is obsessed with winning at all costs.

The rookies are temporarily paired with new training officers, and Officer Nolan is paired with Officer Lopez. When Nolan and Lopez track down an escaped criminal, they discover a little kindness goes a long way. Meanwhile, Jackson is forced to face his f

After Nolan and Talia lose control of a crime scene, they begin to debate whether people are fundamentally good or bad and what that means for a police officer. Meanwhile, Lucy is concerned Tim is enabling his wife's destructive behavior and not taking ca

Talia forces Nolan to confront his personal moral instincts in order to be a good cop after he encounters a kidnapping victim. Meanwhile, Lucy is temporarily placed with a new training officer who tests her patience, and Jackson must confront his failures

Starting over isn't easy, especially for small-town guy John Nolan who, after a life-altering incident, is pursuing his dream of being a police officer.