- Timmy Turner is magically sent to the secret lab of none other than Jimmy Neutron, the boy with the genius IQ. How will Timmy and Jimmy get back to each others own worlds?
- Carl, and Sheen help complete Jimmy's new multidimensional portal, where he looks to see how everyone is doing until he sees Timmy. This later ends up causes a rift between the two. After a jet pack battle, they both land at Cindy's front door, where they learn that she's on vacation for a week. Without a reason to battle, Jimmy and Timmy become best friends and forget about their respective normal ones (Carl, Sheen, Libby, Chester, AJ and Cindy who returned early from vacation), making them all jealous.
Jimmy and Timmy decide to do fight together, fighting first Eustace, then the Crimson Chin villains. Deeming them all too easy, they decide to make their own villain, which Jimmy designs on the computer based on the top ten bestselling video games and they name him "Shirley". Once he comes out on paper, Cosmo and Wanda use their magic to make him alive. Unfortunately, Timmy goofed up big time and made him ADAPTABLE instead of ADOPTABLE.
After betraying him, Shirley has had enough and literally wants to crush Jimmy and Timmy to death, and likes their old buddies because they were never mean to him. Things get worse when the Retroville citizens treat Shirley like dirt and he starts making his own dimension, Retrodimmsdaleville, out of Retroville and Dimmsdale, destroying them.
After apologizing to their friends 500 times and then making them see that they were wrong for forgetting about them, Jimmy and Timmy get them back and they make a plan to make Shirley vulnerable. Once they do, Sam and Hugh are about to "kick him while he's down", but Timmy and Jimmy explain that it is their fault, not Shirley's and apologize to Shirley for how they treated him, which makes him shed tears of joy. He later opens a pizza eatery in Dimmsdale and puts all the dimensions back to normal. In the end, Jimmy and Timmy remain friends, Cindy makes Jimmy tell her she's smarter than him, and then she tells Timmy to give Jimmy his brains back.
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