Dorff is one of the newest actors to be cast in a lead role.
The latest release from A24, who brought The Witch to screens last year, looks like the year's most horrifying film.
20th Century Fox released new video messages and first look images.
A24 and Trey Edward Shults follow-up follows a family engaged with something terrifying just outside their doorstep.
As the cast stacks up somewhat unconventionally, the film seems to be rounding into shape. Count us as excited...