Tensions simmer between Philip and Elizabeth as they disagree over handling orders from the Centre. When Elizabeth loses key intel, Philip enlists Annelise on a mission with an unexpected outcome.

Elizabeth and Philip come together to deal with a mission gone wrong, but struggle to reconcile their ideologies; Stan welcomes a Soviet defector to America; Nina acclimates to her new living arrangements.

Danger mounts for Elizabeth and Philip as they get closer to the inner circle of the CIA Afghan Group.

Philip juggles the many women in his life while Elizabeth takes drastic measures to complete a mission. Stan asserts a plan to save Nina with an unlikely ally.

Gabriel has surprising information; Elizabeth begins to take family matters into her own hands.

Martha and Clark's marriage meets its most challenging test yet; pressure on Philip intensifies.

Philip and Elizabeth struggle with the gravity of unexpected collateral damage.

Philip and Elizabeth deploy a plan for the C.I.A.'s Mujahideen visitors.

Philip and Elizabeth's home and work lives collide in new and dangerous ways. Nina struggles to figure out her next steps. Arkady assigns Oleg and Tatiana to an operation with uncertain potential.

Martha hosts an unexpected guest; Philip and Elizabeth must work a formidable Mujahideen commander.

Elizabeth and Paige take a trip that lands them in treacherous territory.

Elizabeth and Phillip are supposed to get a biological weapon sample but fail to make the exchange when someone is watching. Nina works Anton in hopes it will lead to her freedom. Paige wonders if she can trust Pastor Tim with her secret.

Philip tries with increasing desperation to get rid of a sensitive and dangerous package as family tensions in the Jennings House reach a boiling point when Paige shares a secret of her own.

Paige copes with new burdens that come with her family's secret - as Philip and Elizabeth struggle to contain their cover without destroying their daughter.

A devastating flaw during a mission forces Philip, Elizabeth, William, and Gabriel to confront the depths of their patriotism... and their mortality. In Russia, in striving to be a better person, has Nina put her life on the line?

Philip must consider his life with Martha and make a crushing choice from which there is no coming back.

Martha must finally face the truth she has denied - and her life may never be the same. Plus, a chilling new development in William's work forces the Jennings to face the realities of what a biological war would mean.

The Centre rushes to prepare Martha's exfil as Directorate S agents try to locate her but, it seems that a backup transport was also ordered. FBI tears up the Clark Westerfeld apartment. Martha almost walks into the FBI dragnet. Philip is overcome with self-recrimination...KGB may kill Martha. The FBI intercepts a call to Martha's parents from Woodley Park and stake out the area. Philip gets a call from Rock Creek Park; Elizabeth races to reach her and brings her in bruised but alive. Oleg does not know why backup transport was ordered. Gaad waxes philosophical about his FBI career in flames as the Jennings kids drink beer with Stan's son. Philip is finally honest with Martha, over Elizabeth's objections. Martha knows that she will be completely alone in Moscow. Will tomorrow's plane carry one rat or two? Or will Martha bite the Valium bullet and refuse to be forced to defect and commit further treason?

The Jennings hit their breaking points as they try to handle their local agents such as Martha.

When Paige's long-ago indiscretion threatens to resurface and destroy the family, Philip and Elizabeth find themselves scrambling - and Paige finds herself reevaluating who her parents really are.

Elizabeth completes the last steps of a very personal operation... but at what cost?

As Paige deals with last episode's trauma, she sees her mother in a new light... and finds she has inherited some of her parents' skills. Plus, has Oleg reached his breaking point with Stan?

In the season 4 finale, Elizabeth & Philip race against the FBI to retrieve a mysterious package. Paige finally begins considering whether or not she would like to enter the family business.

After witnessing Elizabeth kill two men, Paige trades in church for training sessions with mom. First, self defense. Second could tear the family apart. The beginning of the end for Paige and Matthew looms.

Stan and Oleg wrestle with the harsh consequences of their complicated history, as Philip and Elizabeth face a new mission with devastating implications for their country.

Philip and Elizabeth tell Paige more about the family business, but pressing new questions arise when an operation takes a ghastly and unexpected turn. Meanwhile, a sensitive package jeopardizes Oleg's life back home.

Philip and Elizabeth have qualms about a new assignment, while a specter from Philip's past creates unforeseen dangers. At the FBI, Stan makes a shocking play that could throw his career into turmoil.

Philip and Elizabeth receive surprising news about Henry -- and shattering news about a past operation. Stan might be falling in love, but Philip wonders if something darker is going on.

Phillip and Elizabeth are stunned by Gabriel with a sudden announcement and a crushing revelation about Philip's past; Stan and Aderholt lure a suspect into their web; Oleg and Ruslan lead their first target into an ambush.

As Paige becomes even more enmeshed in her parents' world, tensions with Matthew Beeman come to a head, Philip and Elizabeth's honeytraps take surprising turns, and Stan faces the consequences of overplaying his hand at the FBI.

Philip and Elizabeth are thrown off balance when things with Tuan take an unexpected turn. Meanwhile, Henry makes a startling proposition and Stan has a disturbing encounter with Frank Gaad's widow.

As Paige becomes even more enmeshed in her parents' world, tensions with Matthew Beeman come to a head, Philip and Elizabeth's honeytraps take surprising turns, and Stan faces the consequences of overplaying his hand at the FBI.

Phillip and Elizabeth are stunned by Gabriel with a sudden announcement and a crushing revelation about Philip's past; Stan and Aderholt lure a suspect into their web; Oleg and Ruslan lead their first target into an ambush.

Paige copes with new burdens that come with her family's secret - as Philip and Elizabeth struggle to contain their cover without destroying their daughter.

The Jennings hit their breaking points as they try to handle their local agents such as Martha.

Martha must finally face the truth she has denied - and her life may never be the same. Plus, a chilling new development in William's work forces the Jennings to face the realities of what a biological war would mean.

Philip and Elizabeth receive surprising news about Henry -- and shattering news about a past operation. Stan might be falling in love, but Philip wonders if something darker is going on.

As Paige deals with last episode's trauma, she sees her mother in a new light... and finds she has inherited some of her parents' skills. Plus, has Oleg reached his breaking point with Stan?

Tensions simmer between Philip and Elizabeth as they disagree over handling orders from the Centre. When Elizabeth loses key intel, Philip enlists Annelise on a mission with an unexpected outcome.