Plot hole: There is a "scarab alarm" when the blue scarab arrives, Shaggy even comments on hearing this. The problem is, The Blue Scarab is a comic book, so the villain and Shaggy wouldn't know what the Scarab alarm sounded like.
Scooby-Doo and Scrappy-Doo (1979)
Episode list - season 3
Starring: Don Messick, Casey Kasem, Lennie Weinrib, Heather North
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