After a disastrous failed hand-over from a independent Syrian liberation army unit, of the terrorist, "Omair Idrisi", Sergeant Daniel "Mac" Macallister, is imprisoned facing a court marshal for hitting his superior officer. Because of the failed hand-over mission, Col. Adeena Donovan, MI6, re-establish the disbanded "Section 20" unit. Mac, is offered a chance to join this new unit. He is quickly set on mission to recruit "Sergeant Samuel Wyatt", a deniable American operator, in captivity by General Farid. During the rescue/recruit mission, other new "Section 20" operators shows their value as members of the new team. The team is assembled in Tripoli, for a mission to capture Idrisi and as well reveal his source of money, Khalid, who transferred 5 million just before the team intervened. The team take custody of Khalid, but Omair eludes capture with help from his wife. Omair phones Mr. Ives, who is an arms dealer with the weapons for sale Omair intends to buy for the money.

Mac, Wyatt and the gang pursue Idrisi and his radicalized British wife. They seek to track him down via an arms dealer who just made a delivery to the cell leader, and was shot down by the same to get rid of loose ends. The crew from Section 20 rescues the arms dealer to find out what weapons he delivered and where Idrisi is. Later, when attacking Idrisi's compound, the US military gets involved, launching a bunker buster missile and putting the team in harms way.

As Jane Lowry surfaces in Budapest, Mac and Wyatt are forced to go undercover to infiltrate a dangerous group of white supremacists that has something she needs.

Mac and Dr. Markov are taken by white supremacist Josef and Rosa Varga to a secret militia base. Jane Lowery targets Col. Donovan. Wyatt whines about being stabbed. Section 20 takes bold steps rescue Mac and Markov.

With Markov taken by Jane Lowry, Section 20 track them down to a drug lord's mansion. Section 20 carry out a plan to stop Lowry and Markov from unleashing a deadly chemical weapon or the whole world will be at their demise.

Lowry and Borisovich continue their cat and mouse games with each other and with Section 20. As 20 closes in on Lowry and Markov, Lowry initiates a plan to set off a device in an airport. Reynolds emotes about her actions.

It's Section 20 v Jane Lowry in a race to get to Omair Idrisi. It's a mission that hurls comms officer Jensen into extreme danger.

As Lowry makes her play to rescue Idrisi from the Col. Parker's black site, Section 20 races to get him first. Jensen stoically recovers from his wounds. Reynolds continues to believe Donovan is hiding something important to the mission.

El equipo se entera de la participación del Coronel Donovan en el Proyecto Tenebrae. Oleadas de soldados de PMC intentan recapturar a Idrisi en una batalla de correr, conducir y disparar contra la Sección 20. Donovan y Lowry tienen otro encuentro cara a cara.

The Russians are coming. Ives loses Idrisi to Russian agents. Twenty goes after the Atlas of covert British agents that Lowry stole and later hid. Stonebridge and Scott's surprise return aids Section 20 in a bold plan.

Seis meses después de su última misión, tres miembros del equipo británico de operaciones especiales de la Sección 20, Gracie Novin, Samuel Wyatt y Thomas "Mac" McAllister, se reúnen para lo que creen que es un ejercicio de "limpieza" rutinario en Malasia. Las cosas se complican cuando su nuevo comandante, un oficial al borde del agotamiento llamado Alexander Coltrane, se entera de que un agente británico, en posesión de información sobre un avión ruso derribado, ha sido asesinado en Kuala Lumpur después de reunirse con una agente rusa encubierta, Katrina Zarkova. El rastro lleva a Wyatt, Mac y Novin a una casa de seguridad rusa donde Katrina y su equipo de soldados rusos intentan rastrear un misterioso "paquete" robado del avión, que se estrelló en el océano en circunstancias sospechosas. El enfrentamiento se vuelve violento cuando miembros de una brutal tríada malaya llegan, desencadenando una serie de peligrosos encuentros en los cielos y rascacielos de Kuala Lumpur.

Section 20 forges an uneasy alliance with Zarkova in hopes of tracking down a nuclear warhead in Kuala Lumpur. High Commissioner McKitterick finds himself in an untenable dilemma, while Novin defies Coltrane's orders to settle a score.

Section 20's search for the missing nuclear warhead leads them to Goa, India, where three scientists have been kidnapped. Section 20 infiltrates a suspicious fund-raiser as Coltrane and new S20 computer whiz deal with a breach in security.

El equipo se ve obligado a depender de Zarkova para apoderarse de tecnología rusa de alta gama, descifrar el código de encriptación y realizar una incursión final a un escondite secreto, donde Vartak, Gopan y los paquetes nucleares esperan.

Section 20 journeys to the Punchan Province and connects with a DEA agent with inside intel on Zaza and Dagon. Coltrane tasks Novin with impersonating the nuke buyer in order to ascertain the WMD's location.

Después de abandonar el hidroavión que secuestraron, Novin y Zarkova se encuentran a merced de la policía corrupta, mientras que Mac y Wyatt encuentran refugio temporal en un pueblo local. Coltrane finalmente descubre la ubicación de las bombas nucleares en maletas, pero la revelación tiene un alto costo. Finalmente, la Sección 20 localiza a Zaza y las bombas nucleares, así como a un intruso inesperado, en un complejo remoto y todo se descontrola. Esperando lo peor, Wyatt hace una llamada a casa, mientras Pavel obliga a Zarkova a enfrentar lo que le sucedió al Grupo Alpha.

As Wyatt convalesces, Coltrane, Mac and Novin embark on a covert, 24-hour mission inside Russia to extract an FSB analyst with potentially vital information. Zarkova questions Pavel's true identity, but chooses to stand by her commanding officer. Tracking Hassan to an outpost in the Indonesian jungle, Section 20 ends up facing off with Pavel and Zarkova, as Chetri zeros in on the nuclear suitcase in a Jakarta mall.

Coltrane defends his decision to go rogue with S20. After tailing Hassan and the nuclear suitcase to a deserted shopping mall in Jakarta, Wyatt and Novin face down threats from Komodo soldiers and, later, Colonel Aldo and his insurgents. As Katrina weighs her allegiances, Pavel resets the parameters of the Russian plans to overthrow the Indonesian government.

En busca de Pavel, la Sección 20 se enfrenta a dos renegados rusos, Natasha Petrenko y Artem Orlov, mientras intentan comprar un software sofisticado diseñado para sabotear un satélite fantasma que contiene una carga preciosa. Después de un breve descanso con su esposa, Madison, Wyatt acepta un trabajo temporal de seguridad para Caleb Montgomery, un desagradable magnate de la tecnología militar, pero pronto se encuentra nuevamente en la zona de peligro.

La sección 20 enfrenta un dilema definitivo mientras lucha contra Pavel y su equipo de traidores rusos por las llaves de los misiles de la era soviética que se creían destruidos años atrás. El conflicto lleva a la S20 desde un pueblo remoto en Filipinas hasta Saloglu, Azerbaiyán, donde tres misiles de largo alcance están listos para ser disparados contra las principales ciudades occidentales. ¿Podrá el equipo detener a Pavel y salvar al mundo del Armagedón?

La Sección 20 se reúne para rescatar a un bioquímico que ha sido tomado como rehén en Kosovo por la mafia albanesa. Pero a medida que la situación se intensifica, se revela una siniestra conspiración para encubrir el desarrollo de un virus militarizado.

Section 20 launches a raid on the Demachi family business in hopes of extracting the location of the bioweapon which leads them to an exchange between Edon and jihadist brothers Zayef and Mahir. While Mac considers a career-changing offer.

S20 is in Tel Aviv, tracing a man with stolen Russian military tech that he plans to sell to Zayef and Mahir. A notorious Israeli gangster makes matters even more complicated. Luckily, S20 picks up a highly-trained friend along the way.

Novin se ve obligado a cooperar con gánsteres, ya que Spencer le da al escuadrón un ultimátum. Después de un enfrentamiento con Zayef y Mahir, Spiegel amenaza con revelar las operaciones de S20. Se plantea una grave amenaza a la alianza de S20 con Zarkova.

Cuando la ubicación de Zayef es comprometida, S20 asalta las instalaciones, lo que lleva a que Mac desobedezca órdenes para mantener a su equipo a salvo. Sospechando que Zayef planea desplegar la tecnología militar robada durante una conferencia de la ONU en Múnich, S20 se dispone a detenerlo.

Mucho tiempo después del incidente en Munich, Wyatt y Novin se reencuentran con Mac, quien ha dejado el ejército desde entonces. Pero aunque vive una existencia aparentemente idílica con su esposa e hija, su pasado violento lo persigue.

Spencer joins S20 to take down Zayef for good. But when intel leads them back to the Demachi's, S20 finds itself embroiled in a feud that may expedite Zayef's plans and place military-grade weapons in the hands of terrorists across Europe.

S20 plans to storm a freighter carrying weapons, but when Spencer administers a kill order, Coltrane grows suspicious. As members of S20 contemplate following their conscience, Zayef divulges intel that could drastically change their fate.

Con Chetri en el viento y Carolyn pisándoles los talones, Novin, Wyatt y Coltrane están en la lista negra y cuentan con escasos recursos. El S20 busca la ayuda de aliados rusos para combatir a los enemigos rusos, y la búsqueda del disco duro de Zayef continúa.

After receiving shocking intel from an unlikely Russian informant, S20 decides to reunite for one final mission to track down Arianna and avenge their comrades. This time, however, they're doing things a little differently.

Spencer joins S20 to take down Zayef for good. But when intel leads them back to the Demachi's, S20 finds itself embroiled in a feud that may expedite Zayef's plans and place military-grade weapons in the hands of terrorists across Europe.

It's Section 20 v Jane Lowry in a race to get to Omair Idrisi. It's a mission that hurls comms officer Jensen into extreme danger.

As Wyatt convalesces, Coltrane, Mac and Novin embark on a covert, 24-hour mission inside Russia to extract an FSB analyst with potentially vital information. Zarkova questions Pavel's true identity, but chooses to stand by her commanding officer. Tracking Hassan to an outpost in the Indonesian jungle, Section 20 ends up facing off with Pavel and Zarkova, as Chetri zeros in on the nuclear suitcase in a Jakarta mall.

The Russians are coming. Ives loses Idrisi to Russian agents. Twenty goes after the Atlas of covert British agents that Lowry stole and later hid. Stonebridge and Scott's surprise return aids Section 20 in a bold plan.

El equipo se ve obligado a depender de Zarkova para apoderarse de tecnología rusa de alta gama, descifrar el código de encriptación y realizar una incursión final a un escondite secreto, donde Vartak, Gopan y los paquetes nucleares esperan.

En busca de Pavel, la Sección 20 se enfrenta a dos renegados rusos, Natasha Petrenko y Artem Orlov, mientras intentan comprar un software sofisticado diseñado para sabotear un satélite fantasma que contiene una carga preciosa. Después de un breve descanso con su esposa, Madison, Wyatt acepta un trabajo temporal de seguridad para Caleb Montgomery, un desagradable magnate de la tecnología militar, pero pronto se encuentra nuevamente en la zona de peligro.

Mac, Wyatt and the gang pursue Idrisi and his radicalized British wife. They seek to track him down via an arms dealer who just made a delivery to the cell leader, and was shot down by the same to get rid of loose ends. The crew from Section 20 rescues the arms dealer to find out what weapons he delivered and where Idrisi is. Later, when attacking Idrisi's compound, the US military gets involved, launching a bunker buster missile and putting the team in harms way.

Después de abandonar el hidroavión que secuestraron, Novin y Zarkova se encuentran a merced de la policía corrupta, mientras que Mac y Wyatt encuentran refugio temporal en un pueblo local. Coltrane finalmente descubre la ubicación de las bombas nucleares en maletas, pero la revelación tiene un alto costo. Finalmente, la Sección 20 localiza a Zaza y las bombas nucleares, así como a un intruso inesperado, en un complejo remoto y todo se descontrola. Esperando lo peor, Wyatt hace una llamada a casa, mientras Pavel obliga a Zarkova a enfrentar lo que le sucedió al Grupo Alpha.

Mac and Dr. Markov are taken by white supremacist Josef and Rosa Varga to a secret militia base. Jane Lowery targets Col. Donovan. Wyatt whines about being stabbed. Section 20 takes bold steps rescue Mac and Markov.

Section 20's search for the missing nuclear warhead leads them to Goa, India, where three scientists have been kidnapped. Section 20 infiltrates a suspicious fund-raiser as Coltrane and new S20 computer whiz deal with a breach in security.