From TV Guide:
"Once you're stuck under the dome, casting is fairly limited because people can't get in, but that doesn't mean there might not be somebody hiding out," says executive producer Neal Baer. "We've cast the beautiful Natalie Zea as a woman who makes an alarming appearance in a few episodes beginning in Episode 9. She plays Maxine, and if you think [the show's big baddie] Jim Rennie (Dean Norris) is trouble, you haven't seen trouble yet. And she'll be connected to a number of our characters."