When the social security number of a young prosecutor comes up, Reese and Finch work together to figure out if their person of interest is the victim or perpetrator.

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Reese and Finch are given the Social Security number of a teenager killed two years ago, questioning the infallibility of the Machine; Finch flashes back to the Machine's origin, and how it was developed.

The latest number is an ex-soldier who's now part of a gang that specialize in robberies. Mr. Reese goes undercover, infiltrating the gang. This triggers memories of Jessica.

Reese and Finch surveil their latest POI, Dr. Megan Tillman, while she's on call and after hours to unravel the threat surrounding the promising young physician.

When the Machine produces the social security number of a judge renowned for his tough sentencing, Reese and Finch have the added challenge of investigating a POI who wants nothing to do with their brand of vigilante justice.

The Machine identifies a school teacher who witnessed a mob hit as their next POI and Reese and Finch rush to save his life.

The Machine identifies a school teacher who witnessed a mob hit as their next POI and Reese and Finch rush to save his life.

When Reese and Finch discover that their latest POI has connections to Cold War Soviet espionage circles, they quickly learn how covert ops were handled in a world before The Machine.

Reese and Finch's game of cat and mouse with Detective Carter becomes infinitely more complicated when The Machine declares that she is their newest POI.

As Detective Carter deals with the fallout from her recent encounter with Reese and Finch, The Machine ups the ante for the duo by giving them four Social Security numbers instead of one.

Reese works the computer while Finch does the legwork with their latest POI, a building super who keeps too close an eye on his tenants. Meanwhile, Detective Carter may finally get her long-awaited glimpse into a case.

When Carter finally comes face-to-face with Reese, he urges her to join forces to help with their latest POI, a scrappy young woman from the wrong side of the tracks who turned her life around and became a lawyer.

Finch and Reese run surveillance on a man who's been unemployed for eight months without his family knowing. Angry that he's been fired, he may pose a threat to society.

The Machine identifies Darren, a teenager whose brother was just murdered, as the next POI. Meanwhile, Finch is growing concerned that the son of his former business partner is dangerously close to finding out about The Machine.

Reese discovers there's more to the story after he infiltrates a smuggling ring to get close to his latest POI.

The Machine leads Reese and Finch to Wall Street when a sharp young trader at a major investment bank becomes embroiled in a multi-million dollar financial scam.

When Moretti gets released from prison, Carter and Mr. Reese team up to protect him from Elias. Meanwhile, Finch's new number belongs to a six month old baby girl.

Finch and Mr. Reese are going after a person who seems to be leading a double life. However, they soon realize there are 2 people with the same social security number, one of whom is in danger and one who's an impostor.

Elias is finally ready to eliminate the dons and become the leader of the underground.

In 2012, Mr. Reese goes undercover as an armored car security guard to prevent a robbery. In 2010, CIA plan to eliminate two of their best agents.

Finch gives Reese the day off ostensibly as a favor but really because the new number is too close to John. He finds out anyway, leading to the question of how far he will go to protect.

Finch and Mr. Reese are tailing a spy working for the NSA. As he gets too close to finding out about the Machine, the Government are out to get him.

Reese is trapped next to a person of interest in a part of the city extremely controlled and needs the help of Finch, Fusco and Carter.