Little Monsters
A young boy is scared of the monster under his bed. He asks his 6th grade brother to swap rooms for the night as a bet that the monster really exists. Soon the brother becomes friends with the monster and discovers a whole new world of fun and games under his bed where pulling pranks on kids and other monsters is the main attraction.
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Little Monsters (1989) is a adventure movie. Starring Fred Savage, Howie Mandel, Daniel Stern. Rated 5.8/10 on TMDB. Watch it online free on ZapFlix.