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
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.