Monsters.Inc.2001.2160p.UHD.BluRay.X265.10bit.HDR.TrueHD.7.1.Atmos-AViATOR

https://www.imdb.com/title/tt0198781/

In order to power the city, monsters have to scare children so that they scream. However, the children are toxic to the monsters, and after a child gets through, 2 monsters realize things may not be what they think