|Behind the Scenes|
"Them", as they are prominently referred to as since they don't have an official name, are specialized entities from the 2014 novel known as Bird Box, and in the 2018 film of the same name as the main antagonistic force. It's unknown where they came from, but they cause an apocalyptic-scale threat all over the world.
As they are never truly seen on screen, physical anatomy is unknown. When shown in the film, they are invisible to the naked eye.
They are explained to be very malicious towards humanity, but never physically harm anyone. What makes them so dangerous is the notion that if one were to see any of these creatures, it will cause them to commit suicide outside of their own control. They have been noted to urge humans to see them with voices that resemble human speech.
Some humans are spared of this suicidal fate and they seemingly use them as their helpers to get more humans to see them. Most, if not all, of the spared humans are mentally unstable and insane.