Person of Interest Season 4: First Look!

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The Person of Interest world has changed.

So states a mystery woman portrayed by Cara Buono in the first sneak preview for Season 4 of the CBS drama, as revealed this weekend at Comic-Con.

The former Mad Men actress and Fred Weller both make their first appearances in the following video, which also takes fans back through Person of Interest Season 3.

In new footage, we see Sam and Root lying low in a chic department store, along with Elias looking displeased to see Reese again and Root warning Harold that a war is at hand, “so pick a side.”

Watch now:

Person of Interest Season 4 premieres Tuesday, September 23 at 10/9c.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.

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Person of Interest Quotes

If we're just information, just noise in the system, we might as well be a symphony.

Root

The moment that often mattered the most, the moment when you truly found out who they were, was often their last one.

The Machine