Rachelle Lefevre

Rachelle Lefevre has joined the cast of CBS' Under the Dome, based on the bestselling Stephen King novel, TVGuide.com has learned.

The series, produced by Steven Spielberg's Amblin Entertainment, is about a small New England town that becomes sealed off from the world by an oversized transparent dome, and will follow the citizens' struggle to survive as they try to learn more about the dome and how to get rid of it.

The Twilight and Off the Map alum will play Julia, an investigative reporter who has just moved to Chester Mills from Chicago with her husband, a doctor at the medical center. Now the editor of the local paper, Julia is more than curious when the mysterious dome descends upon the town.

Secret Circle's Britt Robertson cast in CBS' Under the Dome

Other previously announced cast members include Dean Norris, Mike Vogel, Britt Robertson, Natalie Martinez, Aisha Hinds, Alex Koch, Colin Ford, Nicholas Strong and Jolene Purdy.

In November, CBS granted a straight-to-series order of 13 episodes of the sci-fi series. Niels Arden Oplev, who directed the Swedish version of The Girl with the Dragon Tattoo, will helm the first episode. It will be executive-produced by King, Neal Baer, Justin Falvey, Darryl Frank, Stacey Snider and Lost's Brian K. Vaughan, who wrote the adaptation.