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* History is incomplete.
Gramps was a pale male, with black hair and a beard without a moustache, yellow sclera, fangs, and pointed ears. He wore an indigo tuxedo with a red bow tie
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Powers and abilities
He used a special whistle to control his vampire bats, which he bought at an exotic pet shop. Velma Dinkley realized this when Scooby-Doo and Scooby-Dum could hear it and she couldn't. He also used a watch to hypnotize Lisa into thinking she was a vampire and attacking Shaggy Rogers and Scooby-Doo.
The Scooby-Doo Show
Uncle Leon claimed to Lisa that the vampire in question was her late grandfather. It supposedly took control of her in order to haunt Great Skull Island. When the vampire was defeated, it was discovered to be Uncle Leon in disguise, in a plot to keep his niece from claiming the hotel.
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