Carl Wheezer

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.

Voiced by: Debi Derryberry

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.

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.

Sheen would later star in his own spin-off show, Planet Sheen, which premiered in 2010. In this series, he goes into Jimmy's lab and steals his new rocket ship, which crash lands on the planet Zeenu. Due to the series being short-lived, he is never shown returning to Earth. However, in "The Tomorrow Boys", a 2005 episode of The Adventures of Jimmy Neutron: Boy Genius that involves time travel, Sheen is shown to be living on Earth in the future.

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