The Netflix movie boasts a killer cast and some chilling visuals.
Adapted from the 2014 book, the release sees Bullock as a mother battling seemingly supernatural forces following a horrific worldwide event.
"When a mysterious force decimates the world's population, only one thing is certain: if you see it, you take your life," reads the official synopsis. "Facing the unknown, Malorie finds love, hope and a new beginning only for it to unravel. Now she must flee with her two children down a treacherous river to the one place left that may offer sanctuary. But to survive, they'll have to undertake the perilous two-day journey blindfolded."
Why blindfolded? Well, according to the trailer, those who succumbed to madness -- including Sarah Paulson's character -- described "seeing an entity that takes the form of your worst fears."
The cast includes Trevante Rhodes, Lil Rel Howery, Jacki Weaver and John Malkovich.
"Bird Box" hits select theaters and Netflix on December 21.