An earthquake hits Los Angeles while the team is engaged in a standoff with human traffickers holding child hostages; Jim Street has trouble adjusting to his new life as a patrol officer.
The SWAT team tries to find a woman and her son who are running from an international drug cartel; Hondo makes a distressing discovery about his incarcerated friend's son; Luca mulls over a government program.
Deputy District Attorney Nia Wells enlists the team to protect the jurors of a high-profile bribery trial after some of them are targeted by organized crime in a series of fire-bombings.
Hondo suspects an ulterior motive when his romantic interest's estranged husband requests the team's help apprehending a fugitive who is robbing drug cargo shipments; Jessica is forced to implement departmental budget cuts.
Hondo and Chris try to infiltrate and take back a cruise ship that's under siege by drug smugglers; Street enters the SWAT training academy and finds the competition fiercer than expected, with all of the applicants vying one position that is open.
The team tries to determine the next diamond dealer to be robbed by thieves executing heists across downtown Los Angeles; Hondo is emotionally affected by a suspect's death; Chris contemplates an unorthodox offer from the new woman she's dating.
The team hunts for a band of criminals re-enacting the crimes of the infamous Symbionese Liberation Army; Hondo experiences discrimination from a fellow officer during a SWAT training seminar for local law enforcement in Arizona.
The SWAT team races to find a stalker pursuing Tiffany, a social media star, after the dangerous admirer turns a fan event into a shootout that endangers Jessica.
When the team is called into work on their day off to end a hostage situation, they discover one of the captives is a wanted felon; Hondo saves his sister after she's given a roofie at a nightclub.
The SWAT team must recover DNA evidence kits stolen from a crime lab and bring in the crew responsible; financial strain at home makes it difficult for Deacon to focus on his role as leader of the SWAT division's annual holiday toy drive.
The team faces difficult reminders of a past school shooting when they receive a warning that a copycat plans to re-enact the crime; as the team races to stop the new threat, they flash back to the day of the tense first mission.
Jessica and Chris go under cover in Mexico to save a Mexican federal agent who has been kidnapped by a drug-dealing gang that Jessica helped bring to justice; Hondo's mother worries about him when he engages in renovation projects in her home.
The team races to find a militant group that escaped capture months earlier; now, the criminals take hostages in exchange for a $500 million ransom from corporations they deem corrupt; Hondo's emotional turmoil begins to affect his leadership.
Hondo reunites with an old flame when the SWAT team works with the FBI to bring in a separatist group that has weapons-grade plutonium; the team worries it will lose an annual law enforcement charity competition to the Los Angeles Fire Department.
The SWAT team pursues a group of unknown assailants responsible for a patrol officer's death; Chris reels from the revelation that she knew the patrol officer who was killed; Deacon and his wife prepare to welcome their newest child.
The SWAT team struggles to maintain peace on the eve of an LGBTQ pride festival after a hate crime sparks citywide anger that ignites further violence; Hicks reunites with his estranged gay son; Street worries his mother will be sent back to prison.
The SWAT team tries to zero in on the next target of a carjacking ring that's using deadly force to boost luxury vehicles; Hondo takes a big step to help his childhood friend's incarcerated son; Mumford weighs a major decision.
Hondo has a tense reunion with a fellow Marine, Ruiz, when the team hunts an escaped convict who was broken out of prison by criminals using stolen military weapons; Chris prepares for a difficult goodbye when her former K-9 partner becomes ill.
The abduction of Luca and Street's neighbor sends the SWAT team in pursuit of a home invasion crew targeting domestic workers to gain entry into upscale homes; the SWAT division prepares to help Mumford mark a major career milestone.
The team discovers a new version of PCP with ties to an escaped drug dealer who created a version that ravaged the city decades earlier; Chris weighs a major decision regarding her romantic relationship with Kira and Ty.
The SWAT team finds itself under internal investigation when a civilian is killed while they are trying to bring in the city's most wanted criminal; internal affairs calls Hondo's leadership into question.
The team races to locate the next place a lone gunman will strike; Hondo takes some time away from the team to pursue an investigation that hits close to home; Jessica is presented with an unexpected opportunity.