The Adventures of Jimmy Neutron: Boy Genius is an American computer animated television series created by John A. Davis. It is the first spin-off to the 2001 film Jimmy Neutron: Boy Genius. It originally aired on Nickelodeon for three seasons beginning July 20, 2002, and the final episode aired on November 25, 2006. A second spin-off to the film, Planet Sheen, debuted four years later.
There have also been three tie-ins with special episode crossovers involving the Nickelodeon hand-drawn style series The Fairly OddParents under the title "The Jimmy-Timmy Power Hour" (the first alone, the second and third with the subtitles "When Nerds Collide!" and "The Jerkinators!," respectively); the five main characters from Jimmy Neutron meet with Timmy, his godparents, and his two best friends Chester, and AJ, and often cross between each of their worlds of 2D and 3D animation.
The pilot, named "Runaway Rocketboy," involves Jimmy testing a rocket ship that he has invented, and later uses it when he inadvertently stumbles upon a Yolkian plot to conquer Earth. The pilot was aired in short mini episodes on Nickelodeon before the film's release, and its plot was used for the film Jimmy Neutron: Boy Genius. The pilot was later included as an extra on the "Confusion Fusion" DVD. It was originally supposed to air as a short on KaBlam!, but the show got cancelled before the episode aired.
The pilot had a few differences from the main series. In it, the clothes were different, Judy's hair was darker, the theme song was longer with a few lines that were cut later, Goddard was voiced by Kim Saxon, in lieu of Frank Welker, Carl Wheezer resembled his father, Sheen Estevez was absent and the title card had a picture in the scene, like all the other Nicktoons at the time. Also, the DNA Productions logo with their original mascot, Helix the purple cat-like creature wearing a lab coat and a bow tie, was shown.
John A. Davis created Jimmy (then named Johnny Quasar) sometime during the 1980s and wrote a script titled Runaway Rocketboy (later the name of the second pilot) which was later abandoned. He later stumbled upon the idea while moving into a new house in the early 1990s. He re-worked it as a short film titled Johnny Quasar and presented it at SIGGRAPH where he met Steve Oedekerk and worked on a television series of the short as well as the movie. Jimmy was still called Johnny Quasar before it was decided to name him Jimmy Neutron.
Victor Wilson was hired as the Story Editor. The main writers when the show was greenlit were Steven Banks and Jed Spingarn.
A second spin-off series, Planet Sheen, focused on Sheen Estevez, who accidentally landed on the planet Zeenu in Planet Sheen's pilot episode. 26 episodes were produced by O Entertainment. The show debuted on October 2, 2010, along with T.U.F.F. Puppy. As of 2013, the spin-off has been cancelled, with the final episode having aired on February 15, 2013.
The theme song was originally written by Brian Causey for the pilot episode. Pop-punk band Bowling for Soup later revamped and extended Causey's theme for the film version theme. Ultimately, the original theme was kept for the TV series intro and outro. Carl Wheezer is also very well known for saying, "Croissant," and "Aahh.." through the series; later becoming a meme on popular Internet sites, such as Vine and YouTube.
Although the producers originally wanted to make a fourth season, plans for this season were scrapped after DNA Productions' closing as the result of the lacksluster performance of The Ant Bully. Four scripts were written for the season, but two of these scripts weren't revealed. The new season was planned to be more serious and darker than the previous. The premiere of the season, entitled "Deep Impacts", would be the return of Evil Jimmy, who would have struggled with Jimmy in their definitive last encounter during a battle in the moon. Another episode entitled "Three's a Crowd" was planned to be part of this season to explore the relationship of Cindy and Betty. Nick Dean was also set to return as part of the main cast, Cindy and Jimmy would have become an official couple, new and old villains would have returned and appeared, and the League of Villains would have made more appearances. It was thought of that the series, in terms of year runs, would've been the third longest running Nicktoon series behind SpongeBob SquarePants and The Fairly OddParents, but such a production and assets to O Entertainment and DNA Productions would have been too costly.