Scared a Lot in Camelot (Scooby-Doo): Shaggy's zillionaire Uncle buys a haunted mansion and then disappears.
Sinister Syphony (Dynomutt):
Manyface, a villain of many disguises, used a sinister symphony to send Big City to sleep, stripping it clean.
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Ready to Watch The Scooby Doo Dynomutt Hour, Season 1, Episode 6?