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.