Freddie:So wait Abbadon was really Mr Scruffly the janitor!
Wellma:Yes. He wanted to take over the Blackstone Fortress because it was an abandoned gold mine.
Freddie:That makes no sense.
Wellma:really? That's your problem with this cross over setting.
Although if you want to blow your mind then did you know that Dan Abnett actually wrote a Scooby Doo comic episode so a cross over is not as far fetched as you might think (for clarity it's still very far fetched lol)
EDIT: Possibly it was an actual cartoon episode?? He's definitly written scooby doo comics. You sometimes forget that these are professional writers and a comission is a comission