As Finch and Root go on a seemingly random series of errands to save the Machine against Samaritan's onslaught, Dominic threatens to shoot Harper and Elias unless Reese puts him in contact with Finch.moreless
The Machine sends the team two new Numbers: Elias and Dominic. Meanwhile, Finch and Root get a clue to Sam's whereabouts, and Control tries to learn the truth about Samaritan.
Reese sets himself to solve a case that Carter was never able to close.
Reese and Finch try to protect a software CEO whose behavior becomes erratic after a hacker attack reveals his secrets.
The team's new Number is Frankie Wells, a bounty hunter who refuses to give up on a target despite the threat to her life. Meanwhile, Finch links back up with Beth Bridges.
The team's new Number is a psychologist whose unorthodox technique for helping his patients find closure puts him at risk. Meanwhile, in the past Finch tries to deal with the trauma of losing his best friend Nathan.moreless
Reese and Finch protect a street-savvy grifter who makes the mistake of stealing laundered money from Dominic. Meanwhile, Root infiltrates a software app company on the Machine's behalf.
Reese and Fusco help a transcriber at a software firm who is the team's new Number, while Claire contacts Finch and asks him for help against Decima.
Finch suspects that a fellow juror is trying to rig the proceedings in a murder trial. Meanwhile, Reese begins to open up to the department's therapist.
While Reese and Root look for Sam in an upstate New York town, Fusco helps out the newest Number with the help of a previous one.
Samaritan begins to withhold information from the ISA, raising Control's suspicions. Meanwhile, Root and Reese search for their missing teammate.
The team must go on a seeming suicide run to prevent the financial meldown that Samaritan has engineered.
To demonstrate its power to the Machine, Samaritan launches a massive effort to shut down all crime in NYC for 24 hours... and then unleash it worse than ever. Meanwhile, Finch and Reese try to keep up with the new influx of Numbers, and Root meets with her opposite number.moreless
Reese and Finch receive a new Number: Elias, who Dominic wants dead. Meanwhile, Root rescues Sam from Martine but Sam doesn't want to be rescued, and threatens to go public if they don't let her help save Elias.moreless
The team's new number is a police academy recruit: a loose cannon who is apparently working for the gangs. Meanwhile, Samaritan sends Martine to track down the woman who prevented it from obtaining the virus.moreless
The team's new Number turns out to be an international jewel thief, and Sam has to get close to the man to find out if he's victim or perpetrator. Meanwhile, Finch recruits Root to help him undermine Samaritan's plans to distribute tablets to school children.moreless
The team's new Number is a mild-mannered insurance agent who is pretending to be a police detective to investigate the supposed suicide of a co-worker's brother. Meanwhile, Finch is sent to a conference in Hong Kong and meets an attractive businesswoman specializing in computers.moreless
While Finch, Sam, and Root try to protect a pollster who suspects that Samaritan rigged the elections, Reese is sidelined in therapy due to his high number of shootings during homicide cases.
The Brotherhood goes after two children who stole drug money from them, and Reese has to team up with a DEA agent to stop them. Meanwhile, Finch turns to Elias for help.
The team's new number is a professional wingman, and Fusco has to go undercover as a needy client while Reese deals with a demanding police captain. Meanwhile, Root takes Finch on a scavenger hunt for the Machine.moreless
Reese involves Finch in his attempt to protect a new Number, a mathematics student who is playing a city-wide game. However, they soon discover that the game is much more than a simple scavenger hunt.moreless
After several months of silence, the Machine sends a new Number to Reese and Sam... and Finch, who ignores the call. Meanwhile, Fusco gets a new partner and Elias receives an unexpected visitor.moreless
Rizzo blindsides Jack and grills him about Mia. Dixon learns the girl he saved from drowning was poisoned. Savino and his crew are stuck overnight in the desert.
A former flame of Sheriff Lamb's shows up asking for help. Savino deals with the snitch inside his casino.
A man bent on revenge kidnaps Sherrif Lamb. Savino and Rizzo must deal with a rival mob. Katherine and Laura form a new partnership.
Dixon goes undercover at the Savoy after a series of robberies while Sheriff Lamb and Jack investigate the death of the biggest contractor in Las Vegas.
Sheriff Lamb, Jack and Dixon investigate the murder of a young Vegas showgirl. As the investigation proceeds, they begin to suspect that the case hits close to home for Katherine. When the Savoy lands a whale, Savino tries to use him to lure other high rollers into the casino.moreless
Rizzo causes difficulties for Savino when he hires Diane Desmond to sing at the Savoy. Diane just happens to be Savino's ex-mistress. Sheriff Lamb and the military police join forces when clues to a murder lead to a nearby Air Force base.moreless
The tables are turned when Sheriff Lamb must protect Savino after Milwaukee puts out a hit on the mobster.
Savino interjects himself into local politics when he decides to groom mob-friendly Mayoral Candidate George Grady. Sheriff Lamb looks into the murder of a local dentist who had a gambling addiction.