|This needs a stretch.|
Velma investigates the mysterious costume shop where many of the villains they have captured over the years get their outfits.
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- Harriet Horne (single appearance)
- Butler (single appearance)(no lines)
- This story reveals that Velma Dinkley has a large home with at least one servant, where she maintains a Mystery Museum with a collection of costumes and other memorabilia from their old cases. (This is a second home besides the house in Coolsville she shares with Daphne. It is an indication of her success and wealth.)