After missing and presumed dead for eight years, Marine Sergeant Nicholas Brody is rescued in Iraq, and returns home to his family. But CIA agent Carrie Mathison suspects he might have been turned by his terrorist captors, and believes he could be part of a plan to attack America.

Carrie receives new evidence from an undercover agent and stays glued to the surveillance footage of Brody's home, which reveals a man struggling with his traumatic memories.

Brody prepares to enter the spotlight; Carrie closes in on an al-Qaeda plot.

The political powers that be make big plans for national hero Brody, but his increasingly erratic behavior threatens his media darling status; Carrie grows desperate for evidence linking Brody with Abu Nazir, as Saul directs her to focus on Nazir's money trail.

Brody confronts the lone survivor among the insurgents that held him, leading Carrie to believe she may be proved right about Brody once and for all - but Brody's reunion with his captor surprises everyone; the agency is hot on the trail of the lovers who bought a house near the airport with funds from a stolen necklace.

Reeling after losing key players in Nazir's plot against America, the CIA orders polygraphs on everyone who came in contact with them, including Brody, which Carrie sees as an opportunity to finally learn the truth.

The relationship between Carrie and Brody becomes more complicated when they head into the countryside for the weekend, while Mike and Jessica face the fallout of the truth about their relationship, and Saul catches Aileen on the run to Mexico.

As Carrie and Saul reel from the news that Walker is alive, the intelligence community clashes on the best way to capture him; Brody learns a shocking truth about his captivity.

After his attempt to sever ties with Abu Nazir, Brody finds himself reliving his captivity and recommits to his mission; Carrie finds herself in the middle of a public relations nightmare on the heels of the mosque shooting.

Carrie and Saul identify Walker's contact in Washington but their target has diplomatic immunity; Brody is approached to run for a disgraced congressman's seat in the House of Representatives.

In the wake of the explosion, Saul finds Carrie hospitalized and manic, but realizes her chaotic theories have merit; before his congressional campaign begins, Brody takes his family on a weekend trip to Gettysburg, where he retrieves an important item.

While Carrie is near catatonic and confined to bed, Saul investigates the unsettling implications of her timeline; Walker secures a perch for his mission; Brody makes his final preparations for the Vice President's policy summit at the State Department.

Brody has been elected to Congress. A woman named Roya comes to see him, and asks him to steal a list of homeland targets from Estes's office safe. Carrie is working with the CIA again because Fatima, an informant married to a man working for Abu Nazir, tells Saul that she'll only speak to Carrie. Estes goes to pick up Carrie at her sister's house, and then she's sent to Cyprus, where she's prepped for a brief mission in Lebanon.

Fatima tells Carrie about a meeting her husband - a Hezbollah commander - will be having in Beirut with Abu Nazir, and Carrie and Saul call Estes to tell him and to request a special forces team to capture Nazir.

Colonel Lubaid, who briefly detains Saul at the Rafic Hariri airport in Beirut as Saul is leaving Lebanon

Brody takes his car to be professionally cleaned and to have a strong smoke smell removed. Max and Virgil follow Brody and take photos of him. Brody then takes a cab to CIA Headquarters, where Carrie waits inside for his arrival. As he walks towards the building from the parking lot, she exits and walks past him. He is very surprised to see her and calls her name. She turns and greets him casually.

Brody finds himself prisoner again, but this time it's on American soil. Meanwhile, Carrie is forced to play second fiddle after her rash judgment call at the hotel as Estes is busy keeping Jessica off their trail. Dana's relationship with Finn goes to the next level when their date night turns deadly serious.

Dana is shocked by her visit to the hospital. Faber's Tom Walker questions get him tangled up with the CIA. Brody agrees to help stop an attack on America, but his loyalty is questioned when Gettysburg once again becomes a battleground.

Reeling from the recent ambush, Carrie and the team struggle to regain control of their operation while Brody and his family attend a fundraiser at a Virginia horse farm. Saul visits Aileen in solitary confinement, hoping she'll provide key intelligence on the attack. An anguished Dana pressures Finn to come clean about their hidden crime, but her quest to tell the truth collides with her father's secret mission in ways neither could have foreseen.

He lies for Carrie. He lies for Roya. And he's still lying to Jessica. Brody heads towards a serious meltdown as he struggles to keep his complicated alliances clear. Against Quinn's orders, Carrie stages a risky intervention to keep Brody in line, forcing both of them to confront their mixed emotions. Meanwhile, Dana turns to an unlikely source for comfort.

Brody makes a necessary phone call. Saul teams up with Virgil and Max to dig up some information on one of their own. Carrie finds herself preparing for the most important meeting of her career.

Saul catches up with an old friend and discovers evidence of covert activities by Estes. Brody and Vice President Walden find themselves at odds over the future of their political relationship, while Dana and Finn come to terms with their own differences.

Dangerously close to exhaustion, Carrie continues her hunt for Nazir and begins to suspect there is a mole in the CIA. Roya reveals her true colours under interrogation and Saul finds himself fighting to save his career under unexpected circumstances. Meanwhile, the Brodys struggle to maintain anything close to a state of sanity.

Carrie is faced with a pivotal decision, while Brody meets with Faber to contemplate the future of the family. Meanwhile, Saul undertakes a secret assignment; and Quinn has a decision to make that may prove to be a game-changer.