|This needs a stretch. (Feel free to remove when satisfied of completion.)|
The Mystery Inc. gang have sent Scooby and Shaggy to the gym to get in shape! But a devilish giant donut shows up at the gym and threatens to drive away customers.
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- Myron "Metal Man" McGillicuddy (single appearance)
- Gayle Storm (single appearance)
- Polly Fiberfeld (single appearance)
- Donut Demon (single appearance)(Jackson Viney's disguise)
- Jackson Viney (single appearance)(redeemed)
|Jackson Viney||Angry about not getting more muscles.|
|Jackson Viney as the Donut Demon||To drive the Muscle Factory out of business because he was angry about not getting more muscles.|
- Supposedly, the reader can solve the word and picture puzzles at the end of each chapter to find the suspects and clues they'll need to crack the case.
- There are typos in two of the first three puzzles so that they cannot be solved.