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| This was the first concept art for what developed into "Jimmy Neutron". | | Another earlier Jimmy design and Mom & Dad Neutron.
| | An early Jimmy/Goddard model sheet.
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| | Dogs for a big scene that was cut from the movie. | | |
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| Hero characters for a proposed spin-off from Jimmy Neutron based on the Ultralord character originally designed by Joe Riley. | | Villain characters for a proposed spin-off from Jimmy Neutron based on the Robofiend character originally designed by Joe Riley. | | |
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| | | | Expression sheets used to guide the animators and modelers. |
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| | | | The Sheen design was an earlier version of the character that was later changed to his current form. |
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