El equipo se dirige a México para escoltar a un fugitivo de vuelta a Estados Unidos cuando las cosas se tuercen y Hondo tiene que salvar a un antiguo testigo relacionado con el caso.

Hondo y Hicks buscan desesperadamente a Powell, que ha desaparecido de Ciudad de México junto con una bomba termobárica capaz de matar a miles de personas.

El equipo entra en acción cuando unos asesinos de la Yakuza llegan a Los Ángeles, apuntando a una serie de misteriosos expatriados japoneses. Además, el trabajo de Nichelle pende de un hilo tras ser acusada de aceptar sobornos.

Un traficante de armas chileno secuestra a una mujer y a su hija. Al cruzarse con su hermano, Tan se ve obligado a confesar a su familia su divorcio de Bonnie y Hondo descubre que Hicks ha recibido una oferta de trabajo que podría atraerlo.

Street descubre que un club de moteros ha robado un alijo de balas perforantes y pretenden llevar a cabo un atraco atrevido y mortal; Hondo lucha con los cambios en el trabajo; Nichelle se encuentra en desacuerdo con una antigua compañera.

Tras el vuelco de un furgón con presos en su interior, Hondo y el equipo dan caza a tres fugitivas, entre ellas una asesina en serie que trata de arrasar con todo.

Cuando el equipo se enfrenta a una familia de preparacionistas, Deacon se encuentra en el centro de la tormenta.

When a female robbery crew "honeytraps" and kills several rich VIPs, Hondo and 20-Squad are called in to assist FBI Agent Jackie Vasquez in capturing the dangerous fugitives before the death toll rises. Commander Hicks is shocked when his new love, Maggie, abruptly ends their relationship without rhyme or reason. With help from Deacon and Dr. Wendy, Hicks makes an important decision about his romantic future.

As 20-Squad scrambles to track down a cold-blooded sniper terrorizing Los Angeles, Hondo discovers a link to his own South L.A. neighborhood that brings a personal twist to the hunt for the deadly shooter. Meanwhile, Tan finds himself questioning his leadership abilities while Powell and Alfaro compete in a classic game of SWAT tag.

Tan finds himself on a one-man mission to save his new love interest and her journalist co-workers when mercenaries take over a black-tie correspondents’ dinner. After the group escapes, it’s up to SWAT to track down the well-trained gunmen before anyone else is killed. Meanwhile, Hondo and Nichelle return home to find their house trashed, placing them at odds when it’s revealed that Nichelle has a secret. And when Hicks, Mumford and Buck take a trip down memory lane, it threatens to end their decades-long friendships.

When a crew of violent eco-terrorists abducts the teenage son of an energy company executive, SWAT must untangle the kidnappers’ twisted motives before carrying out a high-stakes rescue mission. Meanwhile, Hondo’s involvement in a shooting draws outrage from the very community he’s dedicated his career to protecting. And, as Deacon is called on to help with the escalating crisis, he’s forced to confront nagging doubts about his retirement.

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. Still reeling from the anger and outrage directed at him by his own community, Hondo questions if he still has what it takes to lead 20-Squad, adding to the fear that he won’t be able to pull the team together in time to save the city.