Sergeant Daniel "Hondo" Harrelson is tasked to run an elite S.W.A.T. unit for the LAPD after his original team leader William "Buck" Spivey, was fired after accidentally shooting an unarmed black teenager during a shootout.

The team must find four escaped convicts before a rival team finds them; Hondo's leadership is called into question when Street flagrantly disregards protocol.

Newcomer Jim Street jeopardizes his spot on Hondo's team; the team searches for a ruthless drug trafficker who is using immigrants as couriers.

A domestic terrorist dies in an explosion and the S.W.A.T. must race to find his partner before more devices are detonated.

Gang violence hits close to home for Hondo, and his imprisoned friend asks him to shield his son from the aftermath. Luca struggles with his grief when his grandfather, a S.W.A.T. legend but a very flawed individual, passes away.

The team's plans to enjoy Christmas vacation with their families and friends are put on hold when a drug cartel's cache of gold bars is stolen; Jessica approaches the police commission president with ideas on how to improve the S.W.A.T. Division.

A misconduct complaint filed against Hondo gets him taken off active duty, so Deacon steps in to lead the team in finding a robbery crew.

Hondo suspects there's an ulterior motive when civilians are taken hostage in a prison riot.

Hondo teams up with an old friend in the DEA on a task force to bring down a drug smuggling ring and to unmask the leader.

Hondo and his team team up with the FBI to stop a domestic terrorist attack involving cyanide gas.

An arrest of an illegal immigrant puts SWAT in a bad light with the people. Meanwhile the President of the Police Commission discovers Hondo and Jessica's affair.

The job becomes personal for Hondo when a friend is killed during a joint FBI/S.W.A.T. mission to stop a robbery crew. Jessica worries the erratic behavior of the FBI task force leader will endanger the team in the field.

Hondo and team go on a citywide search for a kidnapped heiress. Mumford announces he's getting married for the fourth time, setting off alarm bells within the team.

As the team works to de-escalate a hostage situation, the mission takes a dangerous turn, which impacts the team; Jim tires of his romantic entanglements and agrees to let Chris makeover his online dating profile.

Hondo faces his resentment toward his father when he and his sister try to convince him he's not well enough to live alone.

Jim Street debates whether or not his mother should live with him upon her release from prison; "Hondo" and the team are assigned to protect a high-profile Russian journalist who is visiting Los Angeles, California U.S.A.

The life of "Hondo" and his career are threatened when his off-the-books surveillance of his godson's kidnapper is discovered; Jim has trouble acclimating to his newly paroled mother.

Hondo and Deacon must apply all their SWAT training and skills to evade a gang of armed mercenaries hunting them in the Angeles Mountain following an ambush.

A fake 911 call puts "Hondo" and the team on the hunt to stop bombing attacks; Jim's relationship with his mother jeopardizes his career; Jessica is thrown a curve ball by the president of the police commission.