A year after the dome disappears, Barbie, Joe, and the other townspeople gather for a memorial. A year earlier, Julia and Junior try to rescue Barbie and the others, but run afoul of Big Jim.

Just as the walls start to close in on those trapped in Chester’s Mill, a possible exit from the dome is revealed.

The latest threat intensifies, leaving Chester’s Mill residents at risk of being crushed to death; Melanie’s health declines as the egg’s fate remains uncertain.

Rebecca and Sam try to save Chester’s Mill residents as temperatures plunge; Barbie puts his life at risk to help Julia after a terrible accident.

Big Jim finally learns what happened to his wife, Pauline; Chester’s Mill faces a new threat — climate change.

Barbie is apprehended by mysterious men and relentlessly interrogated about the Dome; Big Jim forms a deal that could permanently seal the fate of the Chester’s Mill residents.

Barbie turns to his father for help contacting Julia but realizes that he may not be trustworthy; Big Jim declares himself sheriff of Chester’s Mill.

As Barbie descends further into the mysterious tunnel in hope of finding Sam, he comes across a world filled with unanswered questions.

A cave-in severs Barbie and Sam’s path back to Chester’s Mill during their investigation of a mysterious tunnel; a dust storm rages through the town, as Big Jim and Julia face off in a power struggle.

After Big Jim and Rebecca’s plan left the town divided, Julia takes over as the leader of Chester’s Mill; Norrie and Joe help Melanie find more clues.

Rebecca and Big Jim consider extreme measures as the conditions worsen in Chester’s Mill; clues about Melanie’s connection to the dome are revealed.

Big Jim conducts a census to see how long the town can survive on dwindling resources; acid rain threatens everyone.

When Rebecca discovers an infestation of butterfly eggs on the crops, Barbie risks his life to help her save the town’s food supply.

Barbie’s life is in Big Jim’s hands; the dome becomes magnetized; Julia tries to save the life of a mysterious girl who may have clues about the origin of the dome.

Secrets of the Dome are revealed and Big Jim is determined to put an end to Barbie once and for all. Meanwhile, Junior, Angie, Joe and Norrie discover who the Monarch is after receiving a shocking visit from a familiar face.

While the manhunt for Barbie continues, Big Jim gets the residents of Chester’s Mill riled up and the town demands justice for all of Barbie’s supposed crimes. Meanwhile, Joe and Norrie must find a new hiding place for the mini dome.

Big Jim turns the town against Barbie when the truth about his past is revealed. Meanwhile, Maxine makes it personal when she confronts Barbie’s closest ally.

Julia uncovers the truth about her husband’s disappearance and unravels some of Chester’s Mill’s darkest secrets. Meanwhile, Maxine shows Barbie how she plans to take control of the town.

Barbie and Big Jim realize their lives are more intertwined than they knew when a mysterious woman makes an appearance in Chester’s Mill.

Junior stands up to his father and is shattered when he discovers the truth about his mother’s past. Meanwhile, Julia learns firsthand the powers of the “mini dome.”

Big Jim takes matters into his own hands when he feels his authority slipping away, and the Dome displays its power when a life is taken just as a newborn arrives.

When the town begins to run low on water, the residents of Chester’s Mill begin to fight for the remaining resources. Meanwhile, Julia discovers a strange connection that two of the town’s residents have with the Dome.

The Chester’s Mill residents receive an unexpected visit from their loved ones on the other side. Meanwhile, the community braces for a threat from outside the Dome.

The people of Chester’s Mill panicked state when a meningitis outbreak hits the community, threatening the already scarce supply of drugs. Meanwhile, Julia continues to seek answers to her husband’s disappearance

When a former deputy goes rogue, Big Jim recruits Barbie to join the manhunt to keep the town safe. Meanwhile, Junior is determined to escape the Dome by going underground.

Following Duke’s death, his house catches fire, forcing the town to rally together to form a bucket brigade. Elsewhere, Junior ambushes Barbie, while Dodee and Phil pick up a military frequency.

The residents of Chester’s Mill find themselves trapped under an enormous, transparent dome. Panic escalates as resources dwindle rapidly.

Lisbon accepts Jane’s surprise marriage proposal, but a killer’s quest for revenge may cost them the happy ending they’ve worked so hard to achieve.

Jane agrees to once again pretend to be a renowned psychic and be used as bait in an attempt to lure out a serial killer and give the FBI a chance to apprehend him.

A young man claiming to have psychic powers offers his help to the FBI in solving a pair of murders, but when he leads them to additional victims, Jane and the team begin to suspect that he is in fact the killer they’re hunting.

Jane takes extreme measures as the team tries to apprehend a deadly gang of armored car robbers before their desperation to remain free costs more innocent people their lives.

When Abbott’s old boss, Agent Peterson, threatens Abbott’s career -and possibly his freedom – Jane devises a risky plan to protect his friend’s future.

Jane worries for Lisbon’s safety when the team puts itself in the line of fire to protect the witness in a murder investigation from a skilled assassin.

A murder investigation becomes personal for Lisbon when she learns that her underachieving younger brother, Jimmy, is being sought as a key witness.

The team is brought in to consult on a botched DEA raid, but when Abbott’s former boss tries to blackmail him into keeping the agency’s missteps quiet, Abbott is forced to choose between his career and his morals.

A chance encounter with a military colonel leads Jane to believe the soldier is hiding something, leading him to dig into closed murder case of the man’s wife.

The team investigates a murder linked to a counterfeit diamond operation, but an illness forces Jane to direct his colleagues from the office as he recuperates. Meanwhile, Abbott is concerned that transgressions in his past could harm his wife’s chance to obtain a prestigious job in Washington, D.C.

Jane and Lisbon travel to Beirut where they must work with Jane’s familiar adversary Erica Flynn, who agrees to help the FBI apprehend her boyfriend, a courier for terrorist organizations, in exchange for amnesty for her past crimes.

Lisbon goes undercover as a prison inmate in order to get a convict to turn on her boyfriend, who is the leader of a high-end car theft ring.