The SWAT team works to stop a serial bomber that is using drones as detonation devices; just as Hondo settles into legal guardianship of Darryl, his home life becomes more complicated when his estranged father unexpectedly moves in.
The mayor tasks Lt. Lynch with enacting a departmental review of the squad right as they pursue the unstable and dangerous fugitive leader of an infamous doomsday cult; Luca asks the team to invest in his new passion project, a Guatemalan food truck.
Members of the team bump heads with Lt. Lynch when she signs them up for an off-book, undercover operation to take down a local gang that is printing counterfeit money.
Deacon's family gets caught in the crosshairs of a drug cartel when the team aims to bring down its leader; Hondo receives troubling news regarding his father; Tan is forced to go before an internal review board due to his girlfriend's indiscretion.
Criminals steal a mass arsenal of LAPD assault rifles; Hondo finds himself at odds with his father over the elder man's declining health; Luca is overwhelmed when the entire team reconsiders becoming investors in his food truck.
The Harrelsons engage in a tense family reunion when Hondo's older sister begrudgingly arrives to see their sick father for the first time in decades; the team searches for an abducted human rights activist; Luca's food truck business hits a snag.
Thieves are on the run with a high-tech thermal lance that can cut through almost anything; to find the thieves, the team works to identify their target; Chris confronts an imbalance in her relationship with Kira and Ty.
A family takes a local officer hostage when they're evicted from their home; Hondo reflects on his personal life choices as he helps his father through a medical crisis; Chris' relationship with Kira and Ty reaches a critical juncture.
The team searches for an officer who is abducted during a failed undercover operation; Chris struggles with how to comfort the kidnapped officer's parents when she is restricted from giving them certain details of the investigation.
The SWAT team's task to provide security for a warlord is threatened by assassins determined to take him out; Hondo's father tries to make amends with his mother; Street's foster brother asks for help with a corrupt boss.
Street's foster brother Nate is ensnared in a criminal enterprise that could ruin them both; a ruthless crew uses deadly force while stealing from card casinos; Buck approaches Deacon to partner on a private security opportunity.
Hondo and the team rally to support Street when he puts his life on the line to help his foster brother Nate break away from a drug ring.
Hondo, Deacon, Tan and Cmdr. Hicks engage in a manhunt across Tokyo when an extradited fugitive escapes local custody; the rest of SWAT search for any contacts the criminal cultivated while hiding out in Los Angeles; Street isolates himself.
The team searches for a link between the seemingly unconnected victims of a lone gunman targeting women; Luca assists with a homicide investigation in his neighborhood; Lt. Lynch pushes Chris to do a news interview.
Deacon's second job working private security at a high-profile boxing match places the team in the middle of a kidnapping case when a prizefighter's wife is abducted; Darryl becomes frustrated with his lack of paternal rights regarding his son.
The team's search for an abducted teen leads them to a member of the witness protection program and a decades-old political extremist group; Hondo and his girlfriend disagree over a guest speaker at her community center.
The team must protect a hotel full of civilians after a mission goes wrong and the city's most dangerous gang leaders scatter across the building to find an escape; Luca's brother, a freelance reporter, crosses police lines to shoot footage.
Hondo and the team race to save Buck, their former unit leader, when he goes off grid and they fear he plans to harm himself.
The team searches for an escaped convict who plans to kill Tan and every member of law enforcement who helped put him in prison years ago; Chris comes face to face with internal corruption.
The team pursues a couple reminiscent of Bonnie and Clyde when the duo goes on the run to hunt for a set of rare chess pieces that is worth millions; Darryl's ex-girlfriend visits with his young son.
The team searches for a group of drug smugglers who crash a plane and scatter after a joint mission with the DEA to stop the shipment goes awry; Hondo tries to make amends with Nichelle; Luca experiences anxiety about his return to the field.