In "Bully Boogie", the Boogie Man comes to visit Grim, much to Grim's chagrin. In "Here Thar Be Dwarves", Billy's picnic outing results in him being placed in the middle of a war between the dwarves and the elves.
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I wonder how Billy's picnic is going.
[flies by really fast though the air
Hey Grim! Hey Mandy!
That answers one question but raises so many others.