Darwyn grapples with the loss of Gayle and his failure to stop Mina's suicide bombing in Las Vegas. Upon receiving new intel on Farik's whereabouts, Darwyn plots a trap for Farik, using the terrorist leader's wife as bait.
Cell members prepare to launch an attack, even as the FBI springs its trap. As Salim escapes the dragnet to exact revenge, Mina and Gayle confront their destiny in the desert. Tragedy mars Darwyn's victory as the Cell reveals a surprise.
A new leader is calling the shots for the Cell, and Darwyn learns more details about the planned nuclear strike against Los Angeles. While the men of K10 the Cell work together to prepare the attack, Mina is sent on a deadly solo mission.
Darwyn returns home for a tense reunion with his estranged father. Salim faces the painful consequences of his shameful secret, while Ilija makes his way back to Bosnia and confronts his dark past.
Farik reaches the safety of a secret terrorist compound in the desert after being rescued from a Saudi prison. Darwyn must risk blowing his cover to stop a cell member who embarks on a vendetta against a progressive Islamic televangelist.
Darwyn faces a dangerous dilemma when he is ordered by the terrorist network to secure a powerful military explosive, and his new handler at the FBI refuses to cooperate.
Darwyn is thrust into the position of leader of the new Cell and must work with the terrorists to unmask their secret attack plan. Farik's interrogators try a surprising new method to get him to give up crucial information.
Months after foiling a terrorist attack at dodger Stadium, Darwyn plans to take a teaching job at Quantico. When asked to participate in one last case, a routine recon mission leads Darwyn down a dangerous road to a possible new Cell.
Discovering that Farik's explosion is simply a decoy, Darwyn leaves a clue pointing the FBI in the direction of the Cell's real intended target: Dodger Stadium.
'Hijack' The Cell hijacks a chemical truck in preparation for Youmud Din (Judgement Day) as the FBI prepares to stop them, not knowing that, due to a misunderstanding of the Arabic calendar, the attack will proceed one day earlier than they think.
'Intramural' The Cell buys explosives from a white supremacist militia while Darywn.s new handler, Patrice Serxner, tries to prevent the LAPD from blowing his cover in a conflicting investigation.
'Immigrant' When an Afghan boy arrives at the warehouse looking for training as a jihadi, Darwyn introduces him to a more moderate brand of Islam in hopes of steering him away from terrorism.
'Family' Darwyn befriends a pesticide plant worker in order to buy some of his company's product under the table for the Cell while each of the jihadis cope with personal troubles of their own.
Cell members pose as Iraqi insurgents-in-training in order to infiltrate and take over a secure warehouse as a new base of operations for Youmud Din. After the anthrax plot has been spoiled, Farik has to prove that he is still the right leader.
'Scholar' Farik sends Darwyn and Tommy to assassinate Abdal Malik, whose peaceful teachings are turning extremists away from terrorism, but FULLER sends in an FBI decoy to foil the plan.
Farik learns that the money supply filtering in from Mexico to finance 'Youmud Din Judgement Day' has come to a halt; Farik, Darwyn and Christian cross the border to Tijuana, Mexico, and attempt to straighten out their financial problems.
'Target' Farik and Ilija receive a deadly biological ANTHRAX shipment and prepare for an attack inside a Los Angeles shopping mall.
Farik, an Islamic extremist, recruits Darwyn, a Muslim ex-con who has just been released from prison, to join a terrorist sleeper cell planning an attack in Los Angeles. Darwyn is actually an undercover FBI agent investigating the cell.