‘The Pitt’ Star Fiona Dourif Joins ‘A Head Full of Ghosts,’ Horror Movie Produced by Robert Downey Jr. (EXCLUSIVE)

Fiona Dourif, best known to “The Pitt” fans as Dr. McKay, has joined the cast of the horror film “A Head Full of Ghosts.”

She’ll star alongside the previously announced ensemble of David Harbour, Rebecca Hall, and Esmé Creed-Miles (“Hanna”), as well as Bodhi Rae Breathnach (“Hamnet”) and newcomer Hollie Hill-Pearson.

“A Head Full of Ghosts,” which counts Robert Downey Jr. among its producers, follows a suburban family whose life is torn apart when their teenage daughter’s decent into madness becomes the subject of a reality show. Fifteen years later, her sister Merry faces her family’s dark past with a journalist uncovering the nature of the evil force that undid them. Hill-Pearson will play young Merry, while Creed-Miles will portray the character as an adult. Breathnach will be her older teenage sister Marjorie; and Dourif and Harbour are playing the parents.

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Veronika Franz and Severin Fiala, whose credits include “Goodnight Mommy” and “The Devil’s Bath,” will write and direct. The story is based on Paul Tremblay’s book of the same name.

Lionsgate recently acquired “A Head Full of Ghosts” from Fifth Season. Daniel Dubiecki and Lara Alameddine of The Allegiance Theater are producing alongside Susan Downey and Robert Downey Jr. for Team Downey, with David Gambino and Fifth Season. Scott O’Brien and Brandon Hill will oversee the project for Lionsgate.

Before Dourif broke out in “The Pitt,” which was renewed for Season 3, she appeared in films such as Paul Thomas Anderson’s “The Master,” Gus Van Sant’s “When We Rise” and Christopher Nolan’s  “Tenet.” She is represented by Stephen La Manna at Innovative Artists.

Breathnach’s upcoming projects include “Sense and Sensibility” and the Robert Eggers horror thriller “Werwulf.” She is represented by The Artists Partnership in the UK and by Jackoway Austen Tyerman Wertheimer Mandelbaum Morris Bernstein Trattner Auerbach Hynick Jaime LeVine Sample & Klein. Hill-Pearson is represented by Articulate Agency.