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Sheila Altoonian is a friend of Nan Blake's. She is very jealous of Nan's good looks, so she steals ingredient from all over, to make a youth potion.
Scooby-Doo! Mystery Incorporated
Although Sheila was supposed to be one of Nan Blake's friends, she was secretly jealous of her more youthful appearance while hers were giving way to time. Aging gracefully not being an option she dressed up as a vampire to steal things for her youth potion. This led to suspicion by Mystery Inc. and Sheriff Bronson Stone that Nan might be the vampire. When it came to the climax at a local museum, they trapped the vampire. When Daphne was about to stake it, the vampire gave up, revealing herself to be Sheila who wanted the stolen items to create a youth potion to regain her beauty. Sheila was eventually arrested by Sheriff Stone. (The Secret Serum)
- The Secret Serum (First appearance)