When Barbie tries to recover Sam's body, he is pulled into the chasm and finds himself outside the Dome. He sets out to find the one man who can help him get back into the Dome with Julia: his father, Don. Meanwhile, Julia tries to conceal that Barbie is apparently dead but Big Jim finds out and uses the information for his own purposes.moreless
Barbie and Sam investigate the tunnel behind Melanie's locker at the school, but an explosion cuts them off from the others. A dust storm comes up and Julia must choose whether to help the town or try and rescue Barbie. Meanwhile, Joe and the other three hands recover the egg from the lake.moreless
Julia takes over as the new leader of Chester's Mill, after the town becomes divided over Big Jim and Rebecca's population-control plan. Meanwhile, Joe and Norrie help Melanie search for clues about her identity at the dome wall.moreless
Barbie and Julia take opposing sides when Big Jim and Rebecca take extreme steps to extend the town's resources. Meanwhile, the mystery of Melanie Cross deepens.
Acid rain threatens the residents of Chester's Mill, further endangering their lives. Meanwhile, Rebecca and Lyle argue over the reason for the Dome's existence.
The 2nd Mass finds refuge in a Volm hideout, but tensions with the Volm continue to rise. Meanwhile, Tom teams with Weaver and Cochise in a search for Matt, and Anne reconnects with Lexi.moreless
Barbie risks his life to help Rebecca save the Chester's Mill food supply when she discovers an infestation of butterfly eggs on the town's crops.
Before Big Jim can execute Barbie in the town square, an electromagnetic pulse fells many of the townspeople. Meanwhile, Julia rescues a woman who falls into the lake out of nowhere, and Big Jim receives two visitors who try to convince him to see the error of his ways.moreless
We find the remaining 2nd Mass outside of Charleston when they are suddenly under attack from a new Espheni threat, dangerously different from anything they have previously faced. Finding themselves separated from each other, The Masons must find ways to survive by building new friendships and acquiring new skills and abilities.moreless
Nina finds that her future is Stan's hands. Meanwhile, Paige and Henry are moved to safety as their parents attempt to complete their assignment.
As Phillip gets Fred prepared for a crucial operation, Elizabeth tries to exfiltrate Jared. Meanwhile, Arkady forces Stan to choose.
While Stan continues pursuing the illegals, Philip investigates Stealth and Elizabeth is shocked when she uncovers something about Kate.
Phillip aks Annelise for help on his latest mission and Stan discovers something that could bring him closer to the KGB Illegals.
Both Elizabeth and Phillip are impacted when their mission goes awry. Meanwhile, Stan's life continues to deteriorate.
Neither of the Jennings spies find their latest missions without cost. Meanwhile, Stan's conflict with Oleg sees him trying to get access to an American military program.
KGB agent Charles Duluth helps Phillip use the early version of the Internet to monitor US government communications. Meanwhile, Nina is drawn closer to Oleg when she discovers she may need to face a lie-detector.moreless
Elizabeth and Philip make a dangerous Naval officer the key to a mission, but also a threat to their safety. Also, a Sandinista agent must gain access to Capitol Hill for Elizabeth and Stan finds that protecting Nina has a price.moreless
While Phillip is busy cleaning up after their last mission and Elizabeth tries to reassure Martha, the couple are assigned a replacement handler. At the KGB, Arkady and Oleg disagree how to handle things and the FBI assigns Stan to find a missing scientist.moreless
An old comrade visits Elizabeth and Phillip, resulting in them embarking on a rogue mission. Meanwhile, tensions increase both at the Rezidentura and the FBI.
After completing their latest mission, Phillip's concerns about Elizabeth grow. Meanwhile, Stan receives praise for tracking the KGB walk-in and Paige begins to look into her mother's background.
Elizabeth receives a distress signal and Phillip tries to work out what the consequences of their last operation will be for his family. Meanwhile, Nina and Stan both see opportunities when a the Rezidentura gets an unexpected visitor.moreless
Elizabeth and Phillip find they have not only put themselves and their network at risk, but also their family, when a routine mission goes awry. Meanwhile, Nina starts to change her relationship with Stan and Paige becomes more suspicious of her parents.moreless
A news crew comes to create a story about the group. Meanwhile, the girls go shopping and the truth about the robbery is coming closer to being discovered by the authorities.