Photo Flash: First Look - PERSON OF INTEREST's Season Finale, Airing 5/9

On PERSON OF INTEREST's second season finale, titled "God Mode," Reese & Finch team up with surprising allies in a race to save The Machine from Root and the mysterious international organization Decima, who have both re-emerged with dangerous agendas. As the POI team faces off against enemies old and new, theNature of Finch's relationship with former partner Nathan Ingram is revealed along with his original motivation for wanting to save The Machine's irrelevant numbers. Meanwhile, in her mission to bring Cal Beecher's murderer to justice, Detective Carter finds herself up against the criminal organization known as HR. The second season finale of PERSON OF INTEREST airs this Thursday, May 9 (9:01 - 10:01 PM, ET/PT) on CBS.

Carrie Preston, Amy Acker, Sarah Shahi, Brett Cullen, Jay O. Sanders and Enrico Colantoni guest star.

Check out a first look below!

Photos by: John P. Filo/Giovanni Rufino/CBS

Jim Caviezel

Michael Emerson

Michael Emerson, Amy Acker

Michael Emerson, Peter Friedman, Amy Acker

Amy Acker, Michael Emerson

Michael Emerson

Jim Caviezel, Sarah Shahi

Peter Friedman, Michael Emerson, Amy Acker