The show's main antagonists are Earl P. Sidebottom (also known as The Phantom) and his rat sidekick, Ratticus.

Earl is a boy genius who, sometime until the show's start, got a "D" grade in shop class and retreated to the school's sub-basement boiler room in shame.

There, he built a supercomputer capable of altering reality, which he uses to cause chaos in the school as revenge, leaving the main group to stop him.

Internationally, the show is aired on CBS (part of the "CBS Kidshow" block) in the U.S., Cartoon Network in the Netherlands, CITV in the United Kingdom, TF1 in France, Super RTL in Germany, Nickelodeon and HBO Family in the Latin America, Top Kids in Poland, Rai 3 in Italy, and ABC 5 in Philippines.

[3] In 1999, Alliance Atlantis released a VHS compilation titled "From the Files of Flying Rhino Junior High", containing "Underwaterworld", "The Game", and "Comic Book Chaos".