Hondo confronts his long-held resentment towards his ailing father, Daniel Harrelson, Sr., when he and his sister, Briana, try to convince their dad he’s no longer well enough to live alone. Also, when the SWAT team works as patrol officers for a day, Chris is partnered with Mumford, who intends to make her a surprising offer.

A fake 911 call puts Hondo and the SWAT team on the hunt to stop a white supremacy group from executing bombing attacks on local communities. Also, Street’s relationship with his recently paroled mother, Karen, jeopardizes his career, and Jessica is thrown a curveball by her colleague, Michael Plank, president of the police commission. Hondo’s father, returns Daniel Harrelson, Sr. 1st.

The SWAT team is enlisted by Hondo’s new romantic interest 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.

The SWAT team pursues a couple reminiscent of Bonnie and Clyde, when the duo goes on the run and on the hunt for a set of rare chest pieces worth millions. Also, Hondo and Darryl are surprised when Darryl’s ex-girlfriend visits with his young son, and Luca confronts his fear of failing his requalification to return to the field as he helps Kelly, his mentee.

A high-stakes domestic disturbance involving a father and his two young daughters leads the team to race against the clock to save a group of international activists.

The team races to rescue victims of a sex trafficking ring that is preying on disenfranchised women. Also, Hondo finds himself at odds with Leroy and Darryl over the future of their business, and Street confronts Chris about meeting with his hospitalized mom.

When a robbery crew holds up the iconic downtown Los Angeles library, the team discovers that stolen architectural drawings could lead to a major threat against the city. Also, the squad is surprised by the arrival of a new leader, longtime LAPD veteran and former S.W.A.T. member Rodrigo Sanchez.

Hondo returns as leader; the team is pulled into a dangerous case involving a large stockpile of cash and the Russian mob; Daniel Sr. opens up to Hondo about a painful time in his past.

After an armed robbery crew invades a downtown auction house, the case quickly turns personal for Hondo when his sister, Winnie (April Parker Jones), is taken as one of the hostages.

When Hicks witnesses the assassination of his longtime friend, the team races to find the shooter and determine why he was targeted; Luca struggles with how to help his brother after he's arrested.

When control of a university chemistry lab is seized, the team races to thwart a devastating terror attack.

When classified information falls into the wrong hands, the team races to stop a dangerous plot targeting former members of the U.S. military; Luca is faced with a challenging choice when a family member suddenly falls ill.

SWAT hunts down a Chilean arms dealer after he kidnaps a woman and her daughter from a party in L.A. with unexpected intentions. Crossing paths with his brother, Tan is forced to come clean to his family about his divorce from Bonnie, while Hondo discovers that Hicks has received a job offer that could lure him away from SWAT.

SWAT faces their deadliest adversary yet when a violent cell of extremists looks to extract vengeance by blowing up half of Los Angeles, potentially killing thousands.