第 4 季 共 22 集
播出时间：2021年9月27日
第 1 集 Life and Death
播出时间：2021年9月27日
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.
第 2 集 Five Minutes
播出时间：2021年10月4日
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
第 3 集 In the Line of Fire
播出时间：2021年10月11日
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 connection to one of their own
第 4 集 Red Hot
播出时间：2021年10月18日
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, Wesley must overcome an impossible task
第 5 集 A.C.H.
播出时间：2021年11月1日
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.
第 6 集 Poetic Justice
播出时间：2021年11月8日
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.
第 7 集 Fire Fight
播出时间：2021年11月15日
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 new bet, all while they arrest a series of wealthy female criminals. Elsewhere, Wesley struggles to keep it together under the pressure of his debt to Elijah
第 8 集 Hit and Run
播出时间：2021年12月6日
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 come up with a plan to get them out of it.
第 9 集 Breakdown
播出时间：2021年12月13日
Desperate to break free from his connection to Elijah, Wesley tries to plant a listening device in his office to incriminate him; Officer Bradford and his sister, Genny, learn an unsettling truth about their father.
第 10 集 Heart Beat
播出时间：2022年1月3日
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
第 11 集 End Game
播出时间：2022年1月10日
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.
第 12 集 The Knock
播出时间：2022年1月24日
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.
第 13 集 Fight or Flight
播出时间：2022年1月31日
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 prison riot
第 14 集 Long Shot
播出时间：2022年2月28日
Officers Nolan and Harper help Skip Tracer Randy on his first bounty hunter case. Meanwhile, Officer Chen and Sergeant Bradford are on the hunt for a perpetrator on a citywide crime spree.
第 15 集 Hit List
播出时间：2022年3月7日
Officer Harper puts Officer Aaron through “Plain Clothes Day,” but the exercise is interrupted by an unsuspected visitor. After two witnesses for an upcoming grand jury case are murdered, the team must track down the killers before it’s too late.
第 16 集 Real Crime
播出时间：2022年3月14日
Desperate to reset the way the world sees him, Officer Thorsen reluctantly decides to be a part of a reality show to help rebrand his image, only to be thrust back into yet another deadly situation. With cameras rolling, the show’s producer is found murdered and the team must investigate before Aaron is made suspect number one
第 17 集 Coding
播出时间：2022年4月4日
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.
第 18 集 Backstabbers
播出时间：2022年4月11日
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. Elsewhere, Officer Harper takes matters into her own hands and makes a life-changing decision about her personal life.
第 19 集 Simone
播出时间：2022年4月25日
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.
第 20 集 Enervo
播出时间：2022年5月2日
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.
第 21 集 Mother's Day
播出时间：2022年5月9日
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 Mother’s Day and a romantic vacation.
第 22 集 Day in the Hole
播出时间：2022年5月16日
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 together in a possible drug trafficking case.
