Don't Look Under the Bed, Disney Channel
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This girl named Frances is accused of all kinds of pranks and stuff, but actually she's being framed by the Boogeyman. She gets help from her little brother's imaginary friend, Larry, even though Larry annoys her and she doesn't want to believe in any of this stuff. I dunno what else to tell you. Maybe I'll see it again someday and say more. In which case, I might add a link in the Halloween TV movies section.