Jimmy Neutron

James Isaac "Jimmy" Neutron is the main protagonist of the 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