Hanna-Barbera Scooby-Doo...Mystery Comics #24
In "Mark of the Blue Scarab," Scooby-Doo stumbles into a hidden cave while chasing a mysterious shadow, uncovering an ancient artifact that sets the gang on a trail of ancient secrets and sudden transformations. With archaeologist Brad and the ever-skeptical Fred leading the charge, the team races to decode the Anthro-stone before a rival collector claims it—only to find Mandrell’s office locked and his bizarre transformation a terrifying reality. Written by Mark Evanier and illustrated with dynamic flair by Dan Spiegle, this 1974 mystery blends classic Scooby-Doo suspense with a supernatural twist, all wrapped in a cover by Spiegle that captures the eerie intrigue of the tale.
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Scooby finds a cave and falls in a hole where an archaeologist named Brad is searching for the Anthro-stone. Scooby, digging to see what he hit his head on, discovers the artifact. With the gang in tow Brad takes the tablet to Leo Mandrell, who he hopes will translate the stone. Mr. Shuster, a competitor, arrives and offers Brad $3,000 for the stone, but he refuses. The next morning the gang arrives at Mandrell's office only to find it locked. Fred breaks down the door; Mandrell has apparently been turned into a chimpanzee and the Gorilla Spirit threatens Shaggy.
Plot details indexed by the Grand Comics Database (CC BY-SA).