Underground Beast

Underground Beast is an episode of The Grim Adventures of Billy & Mandy.
== Synopsis ==
Billy and Grim encounter a underground beast.
== Characters ==
=== Main ===
* Billy (voiced by Richard Steven Horvitz) - A idiotic kid who mostly cause every problem. 
=== Supporting ===
*
=== Antagonists ===
*
==Transcript==
== Trivia ==
Category:Episodes
Category:The Grim Adventures of Billy & Mandy
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