Complete story — includes the ending
In the aftermath of Samaritan's attack known as "The Correction," Fusco is being questioned by Internal Affairs and the FBI, who believe he shot Dominic and Elias. Reese and Finch return to the subway hideout, where Harold tries to repair the damage done to the piezoelectric battery charging the briefcase containing The Machine. To his surprise, it starts decompressing on its own, resulting in a fire. Flashbacks to 2006 show Harold apprehensive about the Machine's ever-expanding capabilities, leading him to erase the Machine's memories every night at midnight. Once Root escapes Samaritan's operatives, she seeks refuge in the hideout of one of her former hacker/assassin associates, but he sells her out. Reese joins her to battle a team of Samaritan operatives. They steal 300 PlayStation 3s to create enough storage for the Machine. Harold downloads the Machine, while Reese keeps the systems from overheating with liquid nitrogen. When Finch asks the Machine, "Can you see me?", after a few seconds go by, it responds by opening an empty command prompt followed by a long string of code showing its reboot.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Person of Interest season 5. HTML formatting and reference markers removed. · Content license