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Marlon has light brown hair and is overweight.
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He was jealous of never getting credit, so he created the Gryphon puppet to force the school to be closed so he could open his own show.
- DTV14. Scooby-Doo! Abracadabra-Doo
- The end credits show his name as "Marlon Whirlen" (giving him the same last name as his brother's first name).