Ask @AustinParker651:

Isn't it funny how Maxwell Atoms, the creator of The Grim Adventures of Billy & Mandy wasn't also the creator of Invader Zim? Because not only are Zim and Billy voiced by the same dude, but Gaz's personality is pretty much the same as Mandy's. (With only a few differences)

Billy Slaven
I wouldn't be surprised if Invader Zim and The Grim Adventures of Billy & Mandy are in the same universe...just a thought

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