The team work to stop Samaritan from coming online and targeting them; the battle against Vigilance reaches a conclusion.
The machine sends the team five different numbers to investigate when an unknown entity blocks details about an impending catastrophic event; Root's hackers arrive in New York.
Reese and Shaw are hunted by Decima; Greer uses Finch's greatest weakness -- his former fiancee -- to lure him out of hiding.
Reese goes under cover as a secret service agent in order to get close to the latest person of interest, a congressman who may have the key to derailing Decima's plan for a second machine.
In order to protect the latest person of interest, Shaw and Reese go under cover at a high school reunion; Fusco and Finch go to Washington, D.C., to investigate Vigilance's most recent attack.
When Reese and Finch have to protect a former government contractor who is following a UN diplomat, they are thrust into the murky waters of international politics.
The Machine assigns Root to seek out a janitor with a mysterious past, but when her very presence puts his life in danger, Finch also receives his number.
Secrets of Finch's pre-Reese operation are revealed -- including surprising ties to current events.
Finch tries to protect a 911 operator by going under cover in an emergency call center; the threat proves to be larger than anticipated.
Reese comes back to New York; surprising events lead to the team planning a heist that could send them all to jail.
Reese gets on an international flight -- intending to leave the team and the past behind -- but realizes his travel plans were manipulated.
Multiple enemies target the team as they try to protect a dying man; Reese's absence could lead to catastrophic repercussions.
Flashbacks reveal Finch's creation of the machine; Reese hits the road, leaving the team to deal with the aftermath of their war with HR.
As the team seeks justice for a death, Finch fears one team member will go too far; the number of one of HR's key players comes up in the machine.
The battle to bring a crime organization to justice reaches a new level; Reese's number comes up in the machine.
The machine gives Finch 38 numbers at once; information about Carter's past is revealed.
The team is met with surprises during an investigation into a hypnotherapist; an antiquities dealer has ties to a crime organization.
After being freed from her confinement to the psych ward, Root needs Shaw's help with a directive from the machine; Finch and Reese look into a mild-mannered investigator.
Shaw must stay close to a 10-year-old girl with highly developed surveillance skills when she is identified by the machine; Carter's mission could be exposed.
The team must figure out if a prominent lawyer orchestrated the murder of her husband or if she is being framed; Carter is spotted with Reese by her new partner.
Finch and Reese ask Zoe Morgan, Carter and Shaw to help them determine if a playboy is a predator or a target; Root plots an escape from the psych ward with the help of the machine.
Reese tries to protect an Internet entrepreneur who targets people's privacy; Carter is paired with a rookie partner.
Reese and Shaw struggle to find a naval officer among all those in town for Fleet Week; Carter puts a plan in motion to get rid of those who set her up; Root tests her new surroundings.
