Person of Interest Hot Shots: Amy Acker and Sarah Shahi Return, as The Machine Bugs Out

Reese, Mr. Finch and Detective Carter will have their hands full, and then some, this Thursday on CBS’ Person of Interest — and here’s a few photos illustrating that point.

RELATED | CBS ‘Spoils’ 18 Season Finales, Including Person of Interest, Elementary, NCIS and The Big Bang Theory

In Season 2’s penultimate hour, titled “Zero Day,” Reese and Finch realize that a virus has rendered The Machine erratic, causing it to issue numbers irregularly — and just as they need their superbrain sidekick to help track an elusive tech millionaire. Meanwhile, Carter’s mission to bring Cal Beecher’s murderer to justice lands her squarely in HR’s sights.

On top of all that, the guest-starring cast is chockablock with familiar faces, as Amy Acker, Sarah Shahi, Carrie Preston, Brett Cullen and Jay O. Sanders reprise their roles as Root, Shaw, Grace, Nathan Ingram and Special Counsel, respectively.

RELATED | TVLine’s 2013 Renewal Scorecard: What’s Coming Back? What’s Cancelled?

Want more scoop on POI, or for any other show? Email insideline@tvline.com and your question may be answered via Matt’s Inside Line.