Blaming himself for the tragedies that occurred on the Fourth of July, Darwyn embarks on a suicide mission: he travels to Yemen to find and confront Farik, using his former cell leader's wife as bait.
The FBI and Darwyn move to intercept the cell's plans to detonate a pair of nuclear dirty bombs in Los Angeles on the Fourth of July, but their victory is overshadowed by a pair of tragedies for Darwyn.
The cell's new leader, Karrar, pushes Darwyn aside as plans progress for the nuclear attack on Los Angeles; Farik teaches a lesson about the terrorist way of doing business to an American philanthropist at a school in Yemen.
The future of Darwyn's cell is altered when he urges the FBI to intercept a shipment of nuclear material arriving at the Port of Los Angeles - sent by none other than Farik; Ilija faces his past when he arrives home in Sarajevo.
Darwyn risks blowing his cover to stop one of his cell's operative from taking revenge against a progressive Islamic televangelist; Farik escapes from prison in Saudi Arabia and finds an al-Qaeda safe house.
Ordered by the terrorist network to acquire a powerful weapon, Darwyn finds the FBI unwilling to cooperate; Ilija faces a heartbreaking decision as he prepares to flee for Europe; Farik is expatriated to Saudi Arabia, where he can be tortured.
Darwyn struggles to maintain his cover as he assumes command of a new Los Angeles sleeper cell and questions the experience and skill of his new FBI case agent; Farik's interrogators use new techniques to get him to talk.
Several months after foiling a terrorist attack on Dodger Stadium, FBI agent Darwyn Al-Sayeed is about to start a new life as a teacher at Quantico when he is asked to investigate a terror suspect; former cell leader Farik is interrogated by the CIA.
A new cell awakens with Sleeper Cell: American Terror, the provocative next chapter in the riveting series. The hidden face of terrorism is again revealed and a new attack is underway.
Farik sets the attack on Dodger Stadium in motion by triggering a Decoy explosion. In the midst of several fire trucks arriving on the scene, the Cell's own emergency response vehicle escapes and slips by the FBI with deadly containers of toxic chemicals inside. Before leaving the warehouse Darwyn snags Ilea's ticket to the ballgame and places it inside his Quran as a clue for the FBI. Serxner realizes that the explosion was a decoy and raids the empty warehouse finding the baseball ticket. The FBI is now racing against the clock to intercept the Cell's attack on the stadium.
The Cell kidnaps a chemical truck driver and his rig in preparation for Youmud Din. Meanwhile, Serxner and the FBI prepare to stop the attack in all three cities. Farik gives the jihadis one last night to themselves as he meets and bids farewell to his own wife. After Farik gruesomely murders the truck driver of the phosgene-laden truck (by forcibly making him inhale the toxic fumes), he finally tells the anxious Cell when and what they'll be attacking: The target is Dodger Stadium the next morning, one day earlier than the FBI previously believed.
Ziad, the Cell’s money man/accountant, introduces the Cell to a white supremacist militia that can supply them with demolition explosives, while the LAPD begins surveillance on Darwyn off Gayle's tip. The LAPD investigation later collides with the FBI, nearly blowing Darwyn's cover. But Serxner, Darwyn's new handler, intercedes to save the investigation and prove herself to Darwyn.
While the Cell members prepare for the final attack, Farik heads to Las Vegas to discuss the date for Youmud Din with regional Cell leaders from New York and Washington, D.C. Meanwhile, an Afghan boy, Khashul, shows up at the warehouse hoping to be trained as a jihadi. Darwyn introduces the boy to a more moderate brand of Islam in hopes of steering him away from extremist elements, while Gayle is suspicious after a visit from Bobby Habib's cousin, who tells the LAPD she thinks her ex-boyfriend may be a terrorist.
Darwyn befriends Ernest Jefferson, a pesticide plant worker, in order to acquire some of the company's product under the table for the Cell. Tommy's estranged mother Lynne is in town, but she gets along much better with Christian than her son. Visiting home for the first time in awhile, Darwyn becomes concerned about his own mother's financial situation. Meanwhile, Ilija's burgeoning relationship hits the wall when he learns the girl is an orthodox Serb like those who wiped out his family. Darwyn catches a lead on Farik's true identity.
After the anthrax plot has been spoiled on Farik's watch, he now has to prove that he is still the right leader for Youmud Din. Darwyn tells Fuller that Farik could be planning a suicide attack or car bombing, but he’s not sure. Ilija, meanwhile introduces himself to Ken Bin Al-Waleed, a white, American-Muslim, who trains insurgents to fight in Iraq at a converted warehouse downtown. Farik and the Cell members take over the facility and kill Ken after he refuses to join their cause.
Farik sends bio-chemical student Eddy Pangetsu (from episode 2) to Vancouver, Canada to bring back anthrax that he has acquired with Ilija as his escort on the flight. When Farik is at LAX, he also observes a moderate religious scholar from Yemen, Abdal Malik arriving inside the terminal. Eddy drives the anthrax back in an RV with a mother and children who pose as his family across the Canadian/U.S. border. Back in Los Angeles, 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. Eddy drives the RV to a deserted canyon but when Farik goes to retrieve the hidden anthrax it is not there. Convinced he has been betrayed, Farik executes Eddy and dumps the RV off the side of the cliff. In the meantime, Christian was sent as a back up assassin and kills Abdal Malik.
The explosive Sleeper Cell takes viewers underneath the veil of a sleeper terrorist cell and follows the harrowing challenges faced by an agent determined to uncover its dark, twisted intentions.
The controversial and unconventional drama, Sleeper Cell: American Terror, delves into the harsh inner-workings of a Los Angeles-based Islamic terrorist cell headed by a charismatic and fanatical extremist (Fehr) and a Muslim undercover FBI agent (Ealy) who infiltrates it.
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