Elizabeth and Phillip meet with the eponymous colonel, even though they suspect a trap. Meanwhile at the FBI, Stan's draws ever closed to his neighbors' true identities.
While Stan unexpectedly appears to be getting closer to a Directorate S cell, Phillip and Elizabeth worry about being caught in a sting when they are ordered to meet with a new important source.
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A personal situation in Moscow causes Elizabeth to embark on a mission which puts the couple in danger from both the FBI and the KGB.
Stan unknowingly gets closer to Phillip and Elizabeth when he follows a lead that will point him towards one of Gregory's crew.
While a routine mission for Philip and Elizabeth goes awry, the FBI is in panic mode due to a missing agent.
Phillip and his wife find that they are racing against their FBI neighbor when tasked with preventing the assassinations of top US scientists. Meanwhile, Elizabeth is shocked by Claudia's revelationsconcerning Phillip and Irina.
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Trying to put their distrust aside, Elizabeth attempts to re-assert control over one of her agents and Phillip is reunited with a woman from his past.
When the KGB conducts a hunt for moles within their organisation, it results in a breakdown in trust with allies, as well as between Phillip and Elizabeth. Stan comes up with a plan to keep Nina safe, but she ends up at greater risk.
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The Jennings receive orders to infiltrate the encryption system that the FBI have recently adopted. Meanwhile, a KGB agent under emotional distress risks the exposure of a crucial KGB network.
An assassination attempt on President Reagan causes chaos in both the FBI and KGB. Stan puts pressure on his new spy to find out if the Soviets were responsible.
As Stan investigates the Jennings' dead comrade, Robert, Phillip and Elizabeth are shocked to discover he had a wife they were unaware of.
The spy couple are set the seemingly impossible task of bugging the Defense Secretary's study before a crucial meeting in 6 days time.
Phillip and Elizabeth Jennings seem like any other American married couple, living in Washington D.C. in the 80's. However, they are actually highly trained KGB spies, who must kidnap out a high-ranking defector and return him to Russia.
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An odd scientist lets the refugees into the Center for Disease Control. While they stay at the facility, everything seems peaceful, despite the events going on throughout the outside world. However, peace cannot last forever.
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The group is led by their newest member to the Center for Disease Control while one of the members is forced to make a choice that has harsh consequences.
Neal decides to arrange a con to get to Kate's killer, after Peter and Neal's search makes progress.