The Secret Serum is the 11th of the 1st season of Scooby-Doo! Mystery Incorporated.
Synopsis[]
A vampire steals a painting from a charity auction run by Nan Blake and Sheila Altoonian, causing tensions between the gang and Daphne.
The gang investigates the theft, but Daphne's mother informs them about the Vampire's art theft. They set traps in the greenhouse at the Botanical Gardens, but are attacked by the Vampire. They search for vampire information at the Crystal Cove Spook Museum, but find nothing.
They steal a magazine containing a formula for eternal youth, a rare vintage of wine, and a cursed ruby. The Vampire reveals herself as Sheila Altoonian, who envies Nan Blake for aging better than she has.
She tries to steal the ingredients in Vampire guise to have eternal youth, but is unlikely to pass the final. The Mystery Incorporated group goes their separate ways, and the sinister servant of Mr. E looks on angrily.
Culprit[]
Sheila unmasked
The culprit was Sheila Altoonian as the Vampire, her motive was the make a Youth potion.
Cast[]
- Frank Welker: Scooby-Doo and Fred Jones, Jr.
- Matthew Lillard: Shaggy Rogers and Gary Papluta
- Grey DeLisle: Daphne Blake
- Mindy Cohn: Velma Dinkley
- Frances Conroy: Angie Dinkley
- Patrick Warburton: Sheriff Bronson Stone
- Kath Soucie: Nan Blake and Vampire
- Beverly D'Angelo: Sheila Altoonian
- Kevin Dunn: Garden manager an Maitre 'd
- Tom Kenny: Auctioneer
- Richard McGonagle: Ed Machine