Hugh Neutron

This is a list of characters in the American film Jimmy Neutron: Boy Genius, the television animated series spin-off The Adventures of Jimmy Neutron: Boy Genius and various other media.

Voiced by: Debi Derryberry

James Issac "Jimmy" Neutron is an extremely intelligent boy who uses scientific knowledge and inventions to solve problems, 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. Although he is a genius, he is a kid at heart and has more often than not proven so. 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 revealed in later episodes that they secretly like each other.

Jimmy is usually seen wearing a red T-shirt with his yellow trademark atom symbol on it, blue jeans, and white Chuck-Taylor Converse All-Star sneakers, but blue shorts and brown shoes in the film. He has blue eyes and huge 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" and "Buzz Adams" (from Cosmo in The Jimmy Timmy Power Hour). In addition to his parents, several of his other relatives have also appeared on the show.

Voiced by: Jeffrey Garcia

Sheen Estevez is Jimmy's slightly older, hyperactive, addled best friend, characterized by his unhealthy obsession with the fictional superhero "UltraLord" and the television series, video games, and merchandising inspired by the character. Sheen, who wears an UltraLord T-shirt, has amassed a collection of UltraLord memorabilia and also created a website dedicated to the superhero. Sheen lives with his father and grandmother. Sheen's father makes a brief appearance in season one, although his face is not shown.

Sheen is noted for his extreme, constant bouts of hyperactivity, which he demonstrates multiple times per episode, along with his misdirected intelligence and short attention span, to the annoyance of his peers. Alongside UltraLord, Sheen also appears to be interested in superheroes in general and in typical masculine subjects such as wrestling, and is strongly infatuated with Libby Folfax, becoming her boyfriend by the time of the program's conclusion.

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