Watch Person of Interest

Finch and Root are desperate to save The Machine, which has been located by the rival AI, Samaritan. Meanwhile, Reese is caught in the midst of the ultimate showdown between rival crime bosses Elias and Dominic.

Reese and Fusco are caught in the middle of the two newest POIs, rival crime bosses Elias and Dominic.

Reese embarks on a dangerous personal journey when he is assigned a homicide case Detective Carter was never able to close.

Reese and Finch try to protect a software CEO after a hacker reveals all his secrets and unravels his life.

Reese is determined to protect a bounty hunter who won't allow a potential threat to her life get in the way of her target. Also, Finch tries to set the plan he began in Shanghai in motion.

Reese and Finch attempt to protect a psychologist whose unconventional methods could be consequential. Meanwhile, flashbacks reveal Finch's fragile state in the days following the bombing that killed his best friend, Nathan Ingram.

Reese and Finch try to keep Harper, a street-smart grifter, safe when her plans to steal cash from a medical marijuana dispensary go awry.

Reese attempts to protect a software programmer with a mysterious alter ego, but it's unclear which side of her life the threat is coming from. Meanwhile, Claire, a young hacker who Finch tried to protect from Samaritan, seeks him out.

When the Machine arranges for Finch to be a jury member of a murder trial, he becomes suspicious of a fellow juror. Meanwhile, Reese begins to open up to the department's therapist.

Reese and Root investigate a small town in upstate New York that holds the key to Sam's whereabouts, and more importantly if she's alive.

Control, who oversees the handling of relevant numbers for the government, begins to question the procedures and goals of the Samaritan program.

Samaritan unleashes a cyber-attack on the stock exchange, forcing the team to embark on a possible suicide mission in a desperate attempt to stop a global economic catastrophe.

Samaritan reveals it's power erasing crime from the city for 24 hours in an attempt to force The Machine out of hiding.

Reese and Finch contend for control of the city's gangs after Elias becomes a target for Dominic, the leader of the Brotherhood.

Reese goes undercover as an NYPD police academy instructor to keep an eye on the the next POI, a talented young officer.

Shaw goes undercover with a team of international thieves in an effort to track the latest POI. But an unexpected turn of events could expose her to Samaritan.

Reese, Shaw, and Fusco must protect an unassuming office worker who happens upon a dangerous conspiracy while moonlighting as a fake detective. Meanwhile, Finch heads to Hong Kong as part of his academic cover identity.

Finch believes there's a connection when a gifted political pollster's Number comes up at the same time that his typically ironclad predictions go wrong. Meanwhile, Reese is sidelined by a direct order from Captain Moreno.

Reese is protecting a young brother and sister who become targets of a gang investigation.

Fusco keeps watch over the latest POI, who happens to be a professional "wingman." Meanwhile, Reese must find a way to play by the rules at his new day job as the Machine sends Finch and Root on a mysterious errand.

In the fourth season premiere, the team struggles with their new forced identities by Root. Some can't seem to ignore The Machine's numbers, which puts them all at risk of being detected by Samaritan.