After moving to the neighborhood, Brian Stevenson's family are looking forward to a new life in the suburbs, but Brian isn't as enthusiastic. After his younger brother Eric claims he's been having monsters under his bed, Brian trades rooms with him to prove him wrong. But when he does, he's the one who's proven wrong when he finds a monster snooping around. But it isn't long before Brian meets up with his first real best friend that of all people (or things) turns out to be that very same monster named Maurice, an energetic monster who lives to have fun playing jokes and all the things that a kid can't do under adult supervision. Together as Maurice shows Brian the time of his life in another world under his bed, they form a strong friendship in ways they never imagined. But they also learn that sooner or later, Brian will have to abandon this dream come true for any kid or risk the nightmare of a lifetime becoming a little monster himself! When two evil monsters who rule the monster world learn of this, they abduct Eric as insurance to get Brian to cooperate and stay to become one of them. With the help of a few friends: Including Todd (Eric's best friend), Kiersten Deveraux and Maurice, Brian must take matters into his own hands and rescue Eric before sunrise and before thy become trapped there, doomed to become monsters.
