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Scott and his sister Abby tour the haunted house at a carnival on Halloween night. The two are trapped in the murky mansion when they stop to help Herbert the Goblin, a hapless haunt who's lost the will to frighten. Learning that the carnival is going to be demolished before the night is over the brother and sister try to escape, all the while helping Gilbert. Gilbert meanwhile, teaches the monsters how to be truly scary and save the house.
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