"The Science Fair Affair" is the second segment of the 35th episode of The Adventures of Jimmy Neutron: Boy Genius.


Cindy leads a campaign to ban Jimmy from the school and its science fair forever, citing unfair competition that she believes that other kids deserve a chance to win. The science fair continues as planned, with Principal Willoughby, Sam, Corky Shimatzu, and Miss Fowl judging. Among the kids science projects are Sheen with a starving iguana, Carl with a potato launcher, and Libby with a mood CD player; however, the judges decide that Cindy's sweater maker is the winner. But even an ousted Jimmy steals the spotlight when it's revealed that his father contacted Lars Svenson, and his patented oil-generating machine earns him a Nobel Prize for science, but then malfunctions and places everyone at the science fair in grave danger, until Cindy has the others use their science projects to stop Jimmy's invention. Unfortunately, Jimmy loses the Nobel Prize, and Carl, Sheen, and Libby win the trophy for saving everyone.


  • Lars pronounces the letter J with a Y sound, as in "Yimmy Neutron." However, at the end of the episode he says "I can't believe you're not in jail!".
  • Libby figures out Cindy's secret crush on Jimmy.