A slimy skunk in the cistern, a hairy beast-like monster from "Scarlet Flower", a giant woodlice under the bed - they all exist in reality. All they do is scaring kids because they get electricity of children's screams. An animated film tells the story of the crisis in the world of monsters and their lives. But once all the monsters' peaceful life becomes threatened: a child get to their world. And with kids there is so much trouble that they can annoy even the monsters.