The Jimmy Timmy Power Hour

The Jimmy Timmy Power Hour is a television crossover film trilogy set between the universes in The Adventures of Jimmy Neutron: Boy Genius and The Fairly OddParents. The film series consists of the following: a first film of the same name as this series, a second titled The Jimmy Timmy Power Hour 2: When Nerds Collide! and a third, The Jimmy Timmy Power Hour III: The Jerkinators! The films premiered on Nickelodeon between 2004 and 2006, and were subsequently released to home video. The specials combines 2D animation and CGI graphics

Struggling with his science project, Timmy Turner ("The Fairly OddParents") wishes that he could be sent to the best laboratory in any universe. When his fairy godparents, Cosmo and Wanda, offer him this wish, Timmy is sent to Retroville, the fictional universe of child prodigy Jimmy Neutron (The Adventures of Jimmy Neutron:Boy Genius) to Dimmsdale, Timmys universe, the same when he activates a device designed by Cosmo and Wanda. As they attempt to return to their respective settings, the characters make friends with the various side characters that are not of their own universe, and Timmy becomes attracted to Jimmy's classmate, Cindy Vortex. A defect with Goddard, Jimmy's robotic dog, dooms both characters at the same time.

Timmy and Jimmy enter each other's worlds for a second time, both wanting to ask Cindy out to their school dance celebrating Friday the 13th. In an attempt to gain Cindy's affections, the two engage in a battle of smarts that sends Timmy and his friends to Dimmsdale. As Jimmy seeks to prove that Timmy is a fraudulent scientist, Cosmo and Wanda struggle to keep their existence a secret in Retroville. Professor Calamitous (of Jimmy's universe) unleashes a surge of anti-fairies from Dimmsdale that threaten their Earth's rotation, and head fairy Jorgan of Timmy's universe gets angered by Timmy's friends and their manipulation of fairy magic.

In their third and final encounter, Timmy and Jimmy make amends while trying to defeat the enemies from their own universes—including a monster that they concoct together.

Each film in the Jimmy Timmy Power Hour series combines the 2D traditional animation of The Fairly OddParents and the 3D computer-generated imagery of The Adventures of Jimmy Neutron. This blending of animation techniques was a technical challenge for the studios responsible for both series, according to Keith Alcorn—director of the Jimmy Neutron production company DNA Productions.