I was on the set of Mama, directed by Andres Muschietti and based on his own short film. It was some time last year, and there was this moment where nobody recognized Jessica Chastain because of her hair and general hard rock look. It was a neat moment, because she's an actress who is so specific looking that taking her out of that aesthetic changed her up in a big way.
She's the lead in the film, which is produced by Guillermo del Toro, and which tells the story of two feral girls who are rescued from the woods and who may have brought something sinister into their new home. The original short is very, very creepy, and this film is trying to go from that and then move beyond into even scarier stuff. The trailer succeeds.