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In the episode titled 'Holly Jolly Jimmy', Mel (ironically) lends his voice to the character of Santa Clause.
TV.com:
The Adventures of Jimmy Neutron: Boy Genius follows Jimmy Neutron, his faithful robotic dog, Goddard, and his eclectic friends and family as they experience life in Retroville. Jimmy is a typical kid, who just happens to be a genius. He creates gadgets to improve his everyday life, but his inventions go awry more often than not, and hilarious trouble ensues.
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