Monster Mania is a Fox series where a child named Brian McKenzie (voiced by Jeannie Elias) lives at his missing aunt's mansion and can enter a world of monsters via his closet, making friends with a monster named Boo Marang (voiced by Jim Cummings). The series involved dream pirates, balloon creatures, a giant garden, Robin Hood character lookalikes, fairy tales, and more.
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References
Monster Mania Wikipedia(Text) CC BY-SA