Universal has unleashed four clips from Guillermo del Toro's horror thriller Mama. Jessica Chastain and Nikolaj Coster-Waldau star in this thriller centering on two young girls who go missing after their mother dies. After starting a new life on their own, the two girls find that they are being haunted by their deceased Mama. Watch as this horrifying woman comes back to claim her lost children with over four minutes of new footage.