Person of Interest

Finch tries to revive the Machine. Root fights for her life against an onslaught of Samaritan agents. Fusco is questioned about Elias and Dominic's deaths.

Reese and Finch reboot the Machine, but glitches cause the software to malfunction. Identifying Reese as a threat, it sends an assassin after him.

Reese is forced to revisit his past when the Machine produces the number of a computer analyst who seems to be stealing confidential information.

Shaw escapes her captors, but the team is unsure of her mental state when she begins to act paranoid and reckless.

Reese protects an NYPD analyst whose investigation into a software glitch draws the attention of Samaritan. Reese and Fusco are threatened by an ally of Elias's, looking for revenge.

The Machine sends Reese and Finch to a wedding to protect a pair of POIs before their nuptials. Fusco is angered by being kept in the dark by the team.

Root goes undercover at a radio station to protect the host of a conspiracy theory show who stumbles upon information that could get him killed.

Reese and Finch become trapped in a hospital that becomes ground zero for a deadly viral outbreak. Samaritan's latest recruit has second thoughts. Shaw continues to struggle with reality.

Mysterious criminal mastermind known The Voice returns and traps Reese and Fusco in their own precinct with several armed gang members and the latest POI. Root makes a shocking discovery.

Finch's number comes up when his cover identity is blown and sets off a deadly series of encounters with Samaritan's operatives.

Harold goes on a road trip with the Machine, while the rest of the team receive a new number - the President of the United States.

As Reese and Shaw race to catch up with Finch, he infiltrates a maximum-security government facility in a desperate mission that could mean the end of the war with Samaritan.

Finch, Reese, Fusco and Shaw embark on one last mission to prevent Samaritan from destroying The Machine and cementing its hold over mankind.