C.J.

"A young genius has invented a ray gun that shrinks anything it touches – including you! But when the scientist and her invention go missing, you'll have to keep the shrink ray from falling into the wrong hands, and find a way to bring yourself back to normal size. To solve a problem this big, you've got to think small!

this "young genius" is CJ.

triva
Other people have said that she won three science fairs.​
 * The shrink ray has a two settings on it, shrink and grow.