Jimmy Neutron

Jimmy Neutron - whose full name is James Isaac Neutron, the boy genius and main character. He and his friends are in the 4th grade, and Jimmy is the shortest kid in his class with the biggest head and the biggest hair. Jimmy has a huge IQ and is talented and fascinated with science, though many of his experiments and inventions can go horribly wrong. Don't believe me? Just ask Carl...

Goddard - Jimmy's robotic dog and sidekick. Goddard can transform into all sorts of useful tools and gadgets, including a helicopter and a jukebox.

Carl Wheezer - One of Jimmy's best friends. Carl is allergic, afraid, and puts up with a lot of experiments for which Jimmy uses him as a test subject. Carl has a crush on Judy Neutron and maybe a little one on Miss Fowl, their school teacher.

Sheen Estevez - Jimmy's other best friend. Sheen is hooked on UltraLord cartoons, comics, memorabilia, and video games. Sheen is extremely hyperactive with a grating, loud voice. He has a crush on Libby Folfax. Sheen is also used as an experimental subject, especially when electric shocks are involved.

Judy Neutron - Jimmy's mom. Judy is a work-at-home mom, and when I say work, I mean WORK! She does everything from all cleaning, cooking and laundry to car and home maintenance and repair including rebuilding engines. Jimmy gets his incredible intelligence and mechanical aptitude from his mom.

Hugh Neutron - Jimmy's dad. Hugh is a car salesman and has many pearls of wisdom about life and living, but really isn't too bright when it comes to science and math. He is a well-rounded guy, though, and helps Jimmy try to understand the complicated world of non-science.

Cindy Vortex - Almost as brilliant as Jimmy, Cindy hates playing second fiddle. However, away from peer pressure and the competition of school, Cindy and Jimmy actually do like each other.

Libby Folfax - Cindy's best friend and Sheen's crush. Libby is descended from Egyptian royalty and can't be without her music for too long or she goes into withdrawal.

Miss Winnifred Fowl - The kids' "poultryesque" school teacher. She makes a few chicken sounds as part of her normal speech pattern and has a very long, beak-like nose.