Under the Dome debuts its second episode tonight on CBS and, today, TV Line offers some more casting news. Accoring to the site, Mare Winningham will appear in an episode set to air in August.
The site says she’ll play “Agatha, a deceptively warm caretaker who welcomes Big Jim into the Chesters Mill home shes looking after. However, it quickly becomes apparent that her intentions are anything but pure.”
Big Jim is, of course, played by Dean Norris.
Written by Brian K. Vaughan, this series stars Mike Vogel, Rachelle Lefevre, Jolene Purdy, Nicholas Strong, Britt Robertson, Aisha Hinds, Alex Koch, Natalie Martinez and Colin Ford and is based on the novel by Stephen King.
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