James Isaac "Jimmy" Neutron, (born on March 14) is the main protagonist of the televsion series and movie. He is the world's smartest 10-year-old. He is named after scientists Sir. James Isaac Newton, and James Chadwick who was nicknamed "Jimmy Neutron", because of his discovery of the neutron.
Jimmy is a genius inventor, but his inventions seem to cause more destruction than anything and it is usually up to him and his friends to stop them. He lives in Retroville with his robot dog, Goddard, who is named after Robert H. Goddard (a pioneer in modern rocketry) and his parents, Hugh Neutron, a bumbling car salesman and duck-lover, and Judy Neutron.
Jimmy has a disproportionately large head (which is needed to house his large brain), blue eyes, and brown ice cream-shaped hair. He is often teased because he is shorter than most boys of his age. Jimmy's wardrobe consists almost exclusively of red T-shirts that sport his trademark symbol of electrons, circling a nucleus. He also wears blue jeans and a pair of black and white Converse Chuck Taylor All-Stars. His underwear consists of plaid boxer shorts as shown in the movie and in the first episode of the series, he wears knee socks.