Scoop: Under the Dome Traps Mare Winningham for Mysterious Role

Under the Dome Cast Mare WinninghamMare Winningham is taking a trip Under the Dome.

The two-time Emmy winner — most recently nominated for her turn on Hatfields & McCoys — will guest-star on CBS’ summer smash, TVLine has learned, in a role that is mysterious and maybe even a bit… malevolent?

Winningham will appear in a late-August episode as Agatha, a deceptively warm caretaker who welcomes Big Jim into the Chester’s Mill home she’s looking after. However, it quickly becomes apparent that her intentions are anything but pure.

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“I’m thrilled to be working with Mare Winningham on Under the Dome,” executive producer Neal Baer said in a statement. “She’s my good-luck charm: I worked with her on ER, as well as on Law & Order: SVU (for which she was Emmy-nominated as Best Guest Actress). She brings truth and believability to every role, and she will definitely leave viewers talking.”

An original big screen Brat Packer, Winningham’s most recent TV credits include Hawaii Five-0, the aforementioned Hatfields & McCoys and Torchwood.

Under the Dome, which to date has drawn nearly 20 million viewers to its pilot, airs Mondays at 10/9c.