SWAT tackles a mission with personal ties for Hondo when they race to find a group of missing students and their bus driver, Hondo’s former high school football coach. Also, Hicks has reservations regarding Hondo’s new 20-Squad team addition, Devin Gamble, a cop with a family background deeply entrenched in crime.

When a spree of brutal stash house robberies spills into L.A., 20-Squad must team up with the sheriff's department's gang unit to unmask a violent crew who leaves no witness alive.

The team faces a prison hostage situation, only to be thrown into deeper danger when a bomb explodes, freeing maximum-security prisoners from their cells, including someone with a personal grudge against Hondo.

A blackout throws the city into chaos, forcing 20-Squad onto the streets for an emergency patrol day, which quickly escalates when Hondo and team uncover a terror threat.

Tan is left reeling when his girlfriend is kidnapped, and 20-Squad must race to track down a violent cartel leader who may be behind the abduction.

When back-to-back shootings at women's clinics leave two healthcare providers dead, Hondo and the team investigate whether the shootings were politically motivated.

When two students are brutally attacked, 20-Squad contends with a possible honor killing. Meanwhile, Hondo and Nichelle have their first parenting dispute while searching for a suitable daycare.

Hondo and the SWAT team race to stop a nuclear attack on Los Angeles when radioactive material is stolen from a local lab.

When Hondo learns there’s a $1 million bounty on his head, 20-Squad must race to uncover the mysterious enemy from Hondo’s past who’s intent on revenge. Also, Deacon and Tan butt heads over Tan’s changes to SWAT academy.

20-Squad contends with a hostage crisis; Hondo receives a family visit.

20-Squad races to find a missing child who was abducted from her front yard. Also, Hicks is faced with a difficult decision concerning Gamble.

While working undercover for 20-Squad, Alfaro encounters associates from a previous undercover case in Long Beach, embarking on a dangerous mission that stirs up unresolved issues from the past.

During a hiking trip, Powell and Darlene stumble upon an illegal weed farm and become entangled in the dangerous plot of the cartel that it belongs to.

When violent robbers loot a museum vault, fleeing with almost a billion dollars in treasure recovered from a sunken ship, Hondo and 20-Squad must chase down the thieving killers before they flee the country. Meanwhile, Tan reckons with the fallout from a SWAT Academy accident, and Gamble nervously awaits the verdict of her IA investigation.

SWAT’s anti-terror sting operation at a bus station is thrown into chaos when volatile felons, fleeing the police, burst in and take the bus station hostage. Hondo and the team must play along, maintaining their cover as hostages while they work to ferret out the terrorist in their midst. Meanwhile, Deputy Chief Bennett redoubles her efforts to force Hicks out as SWAT’s commander.

The abduction and brutal torture of two college football stars puts SWAT on the trail of a violent drug dealer looking to extract vengeance for a drug deal gone bad, while Deacon’s heroics bring unexpected attention.

When three of L.A.’s finest are targeted and gunned down in the street, Hondo and 20-Squad enlist the help of LAPD psychologist Dr. Wendy Hughes to assist in stopping a murderous rampage, reopening old wounds tied to the department’s failed response to a school shooting.

When a violent shooting rocks a Los Angeles nightclub, Hondo and 20-Squad are thrust into the dark world of sex trafficking, going head-to-head with a notorious biker club as they race to find a missing girl. Meanwhile, a figure from Alfaro’s past resurfaces, raising the question of whether his wounds run too deep for forgiveness, and deputy chief Bennett pushes commander Hicks to the breaking point.

After an explosive accident at a fruit-packing facility staffed by prison workers, six inmates escape and scatter across the city. Tasked with chasing down the fugitives, Hondo and 20-Squad discover that the worksite explosion was no accident, and that the escapees are working together to carry out a high-stakes robbery. Also, Commander Hicks packs up his office, preparing to vacate the SWAT commander’s post, and Gamble gets sobering news about her jailed father.

When Hondo’s ne’er-do-well cousin, Andre, goes AWOL from his Marine base during basic training, Hondo, Deacon and Daniel Sr. take a road trip to get the kid in line. But when they learn that Andre witnessed an illegal arms deal involving stolen military weapons, Hondo realizes there’s a darker explanation for Andre’s disappearance. And Alfaro plots to work outside the law when he discovers that his mother’s long-ago abusive ex is back in her life, repeating the violent ways of the past.

When an auto carrier truck gets hijacked by a high-speed crew, Hondo encounters a ghost from his past – a violent car thief thought to be long-dead. As the brutal road warriors tear across L.A. in pursuit of a mysterious $60 million car, Hondo’s old rivalry reignites, and he’s forced to confront a long-held fear. Also, Gamble is thrust into a personal crisis when her brother, Leon, becomes tangled in the investigation, putting Gamble’s SWAT future in jeopardy.

The SWAT team undertakes its final mission when a violent crew of ex-pat Russian mercenaries holds Los Angeles hostage after planting hundreds of hidden explosives across the city in a bid to extort the release of their brutal leader, Dmitri Rykov. When Rykov is brought to SWAT for safekeeping, SWAT HQ comes under attack, forcing Hondo and 20-Squad to fight for their very survival.