The Adventures of Johnny Quasar (found prototype "Jimmy Neutron" animated shorts; 1995-1997)
From The Lost Media Wiki
Johnny Quasar is a precursor for Jimmy Neutron. Made in 1995, creator John A. Davis brainstormed the character Jimmy Neutron (then named Johnny Quasar) sometime in the 80's. He wrote the pilot under "Runaway Rocketboy" (later became the name of the 2nd pilot).
He revisited the idea in the 90's while moving out of his home. He then pitched the idea to SIGGRAPH (a computer graphic conference, now called SIGGRAPH 2015). At SIGGRAPH, he met Steve Odekerk.
There is one known footage of this short, available on youtube.