Season 2 Episode 21 episode 21

Person of Interest Season 2 Episode 21 "Zero Day" Guide

Person of Interest Season 2 Episode 21 "Zero Day" Guide

Grace, Root, Shaw, Nathan, and Greer all return as the the Stanton virus threatens to end the POI team. Check out the official guide for Person of Interest Season 2 Episode 21, "Zero Day," airing May 2 on CBS.

THE COUNTDOWN ON A MYSTERIOUS VIRUS CAUSES THE MACHINE TO MALFUNCTION JUST AS THE POI TEAM TRIES TO LOCATE AN ELUSIVE MILLIONAIRE WHOSE NUMBERS COME UP

  • Reese and Finch realize that a virus has rendered The Machine erratic, causing it to issue numbers irregularly.
  • As they race against the viral countdown, the team searches for a tech millionaire so elusive no one has ever seen him.
  • Also, Detective Carter's mission to bring Cal Beecher's murderer to justice lands her squarely within the sights of the HR criminal organization.
  • Carrie Preston, Amy Acker, Sarah Shahi, Brett Cullen, Jay O. Sanders and John Nolan guest star.