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The alien was the disguise of Mr. Groves.
It resembled a tall alien with green skin and a single yellow cat-like eye. It had two rows of white razor-sharp teeth, and multiple tentacles that grew out from the bottom and sides of it's body.
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Scooby-Doo! (DC Comics)
He dressed up as the alien to scare everyone and sabotage Mr. Greeves's exhibit.