Hanna-Barbera Scooby-Doo...Mystery Comics #29
In "The Haunted Riverboat," the gang takes a mysterious trip down the Mississippi aboard the Moonglow, a paddle-wheeler owned by Fred's history teacher, Mr. Hull. With Shaggy and Fred dressed as crew and Daphne and Velma in period attire, the atmosphere grows tense as the boat's eerie reputation and a sudden news report about an escaped gangland boss hint at trouble ahead. Written by Mark Evanier and illustrated by Dan Spiegle, with cover art by Dan Spiegle, this 1974 Western Publishing classic delivers classic mystery vibes with a splash of Southern Gothic flair.
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The gang are riding down the Mississippi on the Moonglow, a paddle-wheeler bought by Mr. Hull, Fred's junior high school history teacher. "Skipper" Hull tells them he wouldn't have been able to afford the riverboat, but the Moonglow is supposed to be haunted and he could only get three men to crew: Hank, Wilson, and Paul. While Shaggy and Fred suit up as crew and Daphne and Velma don period dresses, one of the original crew informs Spider in the boiler room that the kids are staying on board. On his transistor radio Fred hears a newscast that a "gangland boss has escaped from prison."
Plot details indexed by the Grand Comics Database (CC BY-SA).