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He wears thick-framed glasses, has black hair with gray streaks, a mustache and a goatee.
Raffalo took his job seriously, as he responded in an annoyed manner when told he told his science class not to refer to photosynthesis as "plant farts." He also cast himself as an angry individual when he replied to Daphne Blake's question regarding the locket.
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Scooby-Doo! Mystery Incorporated
Mystery Inc. brought one of the Slime Mutant's victims in the middle of one his classes for him to look at, ending it abruptly when his students saw the state of the victim, causing them to flee in fear. He told them the person was encased in a dehydrated cocoon. They left him to study the victim further. Once school had ended, he continued his investigation. He was also attacked by the Slime Mutant, becoming yet another victim of its glowing green liquid.
When Raffalo had been unmasked as the beast himself, he explained that while collecting mold spores for his class, he found out the sewer lead under the bank. He dressed up as the Slime Mutant to scare people away so he could steal the bank's money (because of his low teacher's salary) without any interference, and then planned on framing Franklin Fruitmeir due to the fact that he'd used Fruitmeir's dessert as a key factor in his plot. Raffalo also set up his own 'attack' so no one would suspect him of being the Slime Mutant . When asked about the locket by Daphne Blake, he told her that he'd never seen it before. (Beware The Beast From Below)
- Scooby-Doo! Mystery Incorporated
In other languages
- He was the show's first villain to refer to the gang as "[Those] Meddling Kids".