The SWAT team is enlisted by Hondo's new romantic interest, Deputy District Attorney Nia Wells (Nikiva Dionne), 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 Eric Wells (Michael Trucco), a U.S. marshal who is the estranged husband of his romantic interest, Deputy District Attorney Nia Wells (Nikiva Dionne), requests the S.W.A.T. team's help with apprehending a fugitive who is robbing drug cargo shipments. Also, Jessica is forced to implement departmental budget cuts, and Street makes a heartbreaking discovery about his mother, Karen (Sherilyn Fenn).
The S.W.A.T. team tries to determine the next diamond dealer to be robbed by a group of highly organized thieves executing heists across downtown Los Angeles. When Hondo is emotionally affected by a suspect's death during the case, he seeks comfort from his mother, Charice. Also, while Street worries that Luca, his SWAT training academy instructor, has a personal vendetta against him, Chris contemplates an unorthodox relationship offer from the new woman she's dating.
A group seems to be reenacting the 1974 Patty Hearst kidnapping, with nearly identical demands of feeding the poor and corporations being better to people. Meanwhile, Hondo has been sent to Arizona to train S.W.A.T. officers and encounters a racist state trouper.
Hondo's sister calls him after she gets drugged in a club and Honda goes on the guy's trail while the rest of the team inadvertently lets a hostage out of their sight who turns out to be a suspect in a state-wide manhunt.
The SWAT team struggles to maintain peace on the eve of a Los Angeles LGBTQ pride festival after a hate crime sparks citywide anger that ignites further violence. As Chris grows anxious for her fellow LGBTQ community members calling for retribution, the festival reunites Commander Hicks with JP, his estranged gay son.
The S.W.A.T. 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 military weapons. Chris prepares for a difficult goodbye when her former K-9 partner Champ 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 SWAT team discovers a new version of PCP with ties to an escaped drug dealer who created a version that ravaged the city decades earlier. Tan's personal ties to the case emerge when he brings in his mentor, Ben Mosley (Dominic Hoffman), the former lead detective on the original drug case, to help. Also, Chris weighs a major decision regarding her romantic relationship with Kira and Ty, and Hondo's patience is tested by his new familial responsibilities.
The SWAT team finds itself under internal investigation after a civilian is killed as they attempted to bring in the city's most wanted criminal. As the mission details are revealed, the force's internal affairs team calls Hondo's leadership into question.
The SWAT team races to locate the next place a lone gunman will strike while he is at large in L.A. Also, Hondo takes some time away from the team to pursue an investigation that hits close to home, and Jessica is presented with an unexpected opportunity.
The Emancipators hold a livestream kangaroo court to publicity execute city politicians; Hondo fights to lift Darryl's spirits; Deacon feels unworthy as he prepares to receive one of the LAPD's highest honors.