It looks like Chester's Mill has a new resident! According to TV Guide, Mare Winningham has been tapped to guest-star on "Under the Dome". Winningham will play Agatha, a seemingly warm woman acting as a caretaker for a house. She'll even welcome Big Jim (Dean Norris) into the home, but we'll learn that her intentions are anything but sincere as we discover her ties to the town.
"I'm thrilled to be working with Mare Winningham on Under the Dome," said executive producer Neal Baer. "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."
The 13-episode series stars Mike Vogel, Rachelle Lefevre, Dean Norris, Natalie Martinez, Britt Robertson, Alexander Koch, Colin Ford, Nicholas Strong, Jolene Purdy, Ned Bellamy, Natalie Zea, and Aisha Hinds.
"Under the Dome" airs Mondays at 10/9c on CBS.