<P> This is a list of characters in the American film Jimmy Neutron: Boy Genius and the television animated series spin - off The Adventures of Jimmy Neutron: Boy Genius . </P> <P> Voiced by: Debi Derryberry </P> <P> Jimmy Neutron is a highly intelligent boy who uses scientific knowledge and inventions to solve issues, most of which he causes himself . He is 10 years old in the first season, 11 in the second season, and 12 in the third and final season . He is the son of Judy and Hugh Neutron . His best friends are Sheen Estevez, Carl Wheezer, and his robot dog Goddard . He and Cindy Vortex have a dislike for each other, although it is implied in some episodes that they secretly like each other . Jimmy is usually seen wearing a red shirt with his trademark atom symbol on it, blue jeans, and white shoes, sometimes blue shorts and brown shoes . He has blue eyes and brown hair that is considered "anti-gravity" and is in a whipped - up form, earning him many nicknames from classmates (especially Cindy), such as "Whippy - Dip" from his clone Evil Jimmy, and "Señor Fudge - Head" (from Cosmo in The Jimmy Timmy Power Hour). In addition to his parents, several of his other relatives have also appeared on the show . </P> <P> Voiced by: Jeffrey Garcia </P>

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