From major roles in "Angel," "Dollhouse," "Alias," and now "Person of Interest," Amy Acker is the go-to actress when you need intelligent and deadly in one attractive package. For two seasons, her character, a remorseless assassin who goes by the name Root, has opposed Finch and Reese. But now that the Machine is free, it has been aligning their interests as a second omniscient program, Samaritan, prepares to come online.

Now that Decima has identified Root as a threat, it looks as if Root will be working more closely with Finch, Reese, Shaw, and Fusco. In fact, next week we can even look forward to enjoying a nice, frosty Root/Bear.

[Related: 'Person of Interest' Creator Hopes People 'Keep Faith' in the Wake of Carter's Death]

Yahoo TV spoke with Acker about the repercussions of the last episode as they are felt through the final episodes of the season; the chaos brewing as Decima, Vigilance, Control, Root's South American hacker army — maybe even Elias's crime syndicate? — and our New York library team continue to cross paths; and what Root will have to do to avoid "two gods" going to war.

Your character was always the most fun to watch when she was just crazy and trigger-happy, but now that the Machine is teaching her empathy, she's the most interesting. Which part of her do you most enjoy playing?

It's kind of been the whole journey. Each time they give me another piece of it, it gets more fascinating. And I feel like they've done such a good job of tying it all in. Like [Tuesday] night, how they bring back the trigger-happy Root and teach her a lesson on what you've done and what you make when you make these choices.



It's always most fun to play characters that have growth and that continue to grow and get to change. So that's the most fun part of it for me.

See Acker in "Person of Interest":

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The change is the best part. Carter used to play that part — a human coming to terms with the scary power of technology. Now it seems as if it's Root, only she's coming from the other end: She's a tech evangelist who's discovering her humanity. Do you, as a person, fall more on one side or the other of that division?

Oh, jeez. I've probably learned a lot more about technology through doing this show than I've ever known before. I am probably not a good spokesperson for technology other than what I've learned on "PoI."



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It was great to see that moment with Finch when her faith in the Machine is shaken — where she says, "There's never been a plan," and she realizes the janitor's faith was a result of her actions and that she represented the chaos and cold in the universe. Does Root have any more soul-shaking moments coming up this season?

That was kind of a big one for now, I think. I hope that it comes up again. I think those scenes and those conversations she has with Harold are kind of a buildup from their time in the library. It's kind of all going into that moment where it all came to that decision about questioning everything she's believed in.



I don't know. I'm excited to see if there are any more. We still have more scripts to come. But there's so much as the season progresses. I think the question that really is the one that takes over is, "Do you really want to see what it's like when two gods go to war?" Where I'm trying to get everyone on board to make sure Samaritan doesn't come online. That's sort of Root's battle at this point.