- This about the Charlton Comics story. For the unrelated Scooby-Doo, Where Are You! episode, see Hassle in the Castle.
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Shaggy visits the castle of a cousin who may be a vampire.
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- Mystery Inc.
- Great Uncle Hugo (only time mentioned)
- Countess Lubella (only time mentioned)
- Anton Igotcha (only time mentioned)
- Adolph (single appearance)
- Rudolph Igotcha's castle
- Castle key
- Scooby-Doo #1 (September 1992).