Amy Acker is planting roots at Person of Interest, where she has been promoted to series regular status for Season 3, it was revealed Saturday at Comic-Con.

Previously at the CBS Upfronts, it was announced that the drama had upgraded Sarah Shahi, who plays Agent Shaw, to series regular.

A Whedonverse alum, Acker recently told TVLine that she expected to return in some capacity — she just wasn’t sure to what degree.

“I was really happy that I got the phone call [from The Machine] at the end [of the finale], so I feel like they have to at least bring me back,” she said. “The great thing about science fiction shows is I really don’t know even what the character is going to be [at any moment]. I feel like I took such a crazy journey [as Root] this year, learning all this stuff I did in the finale about The Machine and Harold. And now that she’s had lots of therapy, we’ll see!”

POI returns Sept. 24, now airing Tuesdays at 10/9c. Check out this Comic-Con trailer, juxtaposing you’re-being-watched art with you’re-being-watched reality:

http://www.youtube.com/watch?v=0KoElIeOJcM