|This needs a stretch. (Feel to remove when satisfied of completion.)|
* History is incomplete.
The demon was the disguise of Knox Jerkins.
He is a giant grey demon with red eyes and gray hair. He also wears a purple suit.
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Scooby-Doo! (DC Comics)
He was jealous that Lewis stole his girlfriend, Jenny. So he dressed up as the demon to scare him away and get his girlfriend back.