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 other's own worlds?

Jimmy Neutron and Timmy Turner vie against each other for Cindy's affections and Professor Calamitous employs Cosmo and Wanda in his evil plans.

Jimmy and Timmy are at it again: bickering over the affections of Cindy, but somehow end up fighting off enemies together!