A reclusive billionaire software genius who created the Machine to predict terrorist activities. He recruits Reese to intervene for individuals the system identifies as being of interest, and later weaponizes the Ice-9 virus to eliminate Samaritan before surviving and reuniting with his former fiancée.
Finch hires Reese to investigate persons of interest
Finch manages Fusco as an inside contact
Root pursues Finch to access the Machine
Shaw eventually helps Finch
Root pursues Finch and the Machine
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