This just in from The Hollywood Reporter:
Newbie actress Grace Victoria Cox is the latest cast on Under the Dome! The casting marks Cox’s first screen credit.
The 18-year-old Cox will recur as the lithe, mysterious, beautiful and almost regal Melanie, who catches the eye of Joe (Colin Ford). Poised and ethereal, Melanie is from the right side of the tracks and is a clear contrast to Norrie (Mackenzie Lintz).