Jessica Chastain Reveals Dark Secrets of 'Mama'

Oscar nominee Jessica Chastain's ruby-red locks turn pitch black for her role in the dark, supernatural thriller Mama from executive-producer Guillermo del Toro, and we have a first look behind the scenes!

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"It's going to be the type of film that the scares are really psychological, and it's a slow-burn scare," says Jessica. "Also it'll make you feel things, because I approach every film like it's a drama -- I approach it like [the characters are] real people and I have a great responsibility to portray them."

In theaters January 18, Mama stars Jessica and Game of Thrones actor Nikolaj Coster-Waldau as Annabel and Lucas, a couple who unexpectedly take in a pair of girls discovered in the wild. The feral pair were abandoned as babies in the woods the day their parents were killed, and miraculously, mysteriously survived for five years. When they are finally rescued and try to adjust to a brand-new life with their uncle Lucas and Annabel, it appears that someone -- or something -- still wants to come tuck them in at night. Are the sisters experiencing traumatic stress, or is a malevolent force coming to visit them?

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Directed by Andy Muschietti, Mama also stars Megan Charpentier and Isabelle Nelisse.