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.
With the cell about to attack Los Angeles with two dirty bombs, the FBI swoops in for a raid on their headquarters.
When a new cell leader takes control of the group, Darwyn loses his access to information by being kept out of all important discussions.
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.
While Darwyn's sleeper cell superiors are telling him to confiscate nuclear material for an attack, his FBI bosses don't want him making the move.
Darwyn is named leader of the newly formed Los Angeles sleeper cell, a position he hopes will help him uncover secret attack plans.
FBI agent Darwyn Al-Sayeed is given the challenging assignment of infiltrating yet another terrorist sleeper cell.
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.
The cell uses a diversion to evade authorities and carry out the terrorist attack on Los Angeles.
In preparation for the attack on Los Angeles, the cell steals a truck full of dangerous chemicals.
After Gayle informs the Los Angeles Police Department that Darwyn may be a terrorist, the cops begin following his every move.
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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