Samaritan makes one last desperate attempt to preserve itself from Finch's virus, and the team go on what may be a suicide mission to stop it.
Finch breaks into the NSA to plan the virus that will destroy Samaritan... and the Machine. The only ones who can get him out alive are Reese, Sameen, and the Machine, if they can get to him in time. Meanwhile, the Machine shows Finch simulations of what the world would have been like without it.moreless
The President is tapped as the next Person of Interest, and the team finds itself receiving some unexpected help. Meanwhile, Finch goes on a roadtrip with the Machine to begin his final campaign against Samaritan.moreless
After Finch goes to the wrong place at the wrong time, Samaritan gets a fix on him and won't stop until it captures him. The team rallies to protect their friend... but not everyone will come out alive.moreless
The Voice uses a hapless locksmith to plant a bomb in an investment firm, in the first step of a new plan. Meanwhile, Sameen makes her way to New York and Root finds her.moreless
While Root protects a radio host who has tapped into Samaritan's secret communication system, the Machine instructs her in how to use it to contact Sameen. Meanwhile, Samaritan keeps chipping away at Samaritan's resolve, and Fusco realizes that Finch and Reese will never trust him with the truth.moreless
Reese and Finch are trapped in a hospital ER when a superflu breaks out... and they realize that Samaritan is responsible. Meanwhile, Fusco continues his own investigation, while Sameen stages another escape.
The team's new assignment is protecting a couple on the day of their wedding. Someone wants to stop the wedding... or do they? Meanwhile, Fusco crosses paths with Bruce when the two of them investigate the new player in town, each unaware that it's Samaritan.moreless
Samaritan is connected to the newest Number: a sound analyst who is looking into the death of a high school classmate. Meanwhile, Elias' friend Bruce demands answers concerning who murdered the crime boss.moreless
Sameen escapes her captors and reunites with her teammates, but they soon realize that their friend may not be as free as she believes.
The team's newest Number has ties to the CIA, endangering Reese's cover when he's forced to intervene.
While Reese and Fusco deal with a backlog of Numbers, the Machine starts giving out false Numbers after its recent reboot. Worse, it flags three of the team members as threats due to their violent histories, and locks Finch and Root out of the system.moreless
Reese and Finch try to get the case containing the Machine's damaged code to the station so that they can decompress it. Meanwhile, Fusco deals with the aftermath of Dominic and Elias' shootings, while Root tries to dodge Decima's agents without the Machine's help.moreless
Alex goes to Rome, Italy with a dangerous double mission, identify the contractor handling the multi-million dollar payments for Black Dagger and keep hidden his true mission from the CIA/FBI task force. Meanwhile, Katya provides help to her son from an old friend and Alex is surprised to learn details of his mother's past. While in Italy, Sam attempts to buy a cache of SVR intel from an Italian broker.moreless
Natalie must enlist an outsider for help finding important information on Black Dagger; while Alex and Sam plan a risky sting operation to capture an SVR Operative. Katya and Mark follow the money trail for Black Dagger, but needs Alex to use the Task Force in order to find the rest of Black Dagger's money trail.moreless
Alex teams with his family for the greater good. FBI is looking for a mole, including a lie detector for the twitchy Alex. Victor working new angles to spy on the O'Connors.
Katya and Mark try to access encrypted laptop and are under suspicion by the resident. Alex and FBI are embarrassed by not finding the laptop. Victor and Natalie are on the rocks. Plus a surprise ending!moreless
Katya, Mark and the SVR race Alex and the FBI for an encrypted laptop hidden in Philly city hall.
To combat Root and Decima, Reese and Finch must seek out unusual allies to save The Machine. Meanwhile, HR prepares to eliminate Carter when she probes into Cal's death. And in the past, the final fate of Nathan is revealed.moreless
The Machine becomes increasingly erratic because of the computer virus, and Reese and Finch must find an elusive tech millionaire. Meawhile, Carter puts herself at risk when she tries to find Cal's killer.moreless
The newest Number is a famous cardiologist, but by the time Reese gets to the man, it's too late: he's already been given a slow-acting irreversible poison. While Reese and the doctor try to track down the man who poisoned him, Carter has a tough decision to make when IAB moves in on Fusco for the murder of his partner a year ago.moreless
While Carter tries to determine if her boyfriend is working with HR or not, Finch infiltrates a tech corporation to determine if their new Number is trying to help the company or hurt it.moreless
While Carter deals with corruption within her own department, Reese and Finch help an elderly gambler and try to figure out why the mob wants him dead.