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Holly Graham is the niece of Dr. Alexander Graham.
Scooby-Doo! Night of 100 Frights
She was secretly the Mastermind. She wanted to frame her uncle so that she could steal his inventions. She used holograms of herself to give herself an alibi.
- At the end of Scooby-Doo! Night of 100 Frights, Shaggy Rogers joked that her name, "Holly Graham", obviously sounded like hologram, which is what all the enemies were.