What if the Gumazing Gum Girl debuted in the 1960s/The TJ Gabby Power Hour

The TJ Gabby Power Hour is a television crossover film trilogy set between the universes of Recess and The Gumazing Gum Girl!. The series consists of the three films The TJ Gabby Power Hour, The TJ Gabby Power Hour 2: When Nerds Collide, and The TJ Gabby Power Hour 3: The Jerkinators. The films premiered on Disney Channel between 2004 and 2006, and were subsequently released to home video.

The TJ Gabby Power Hour (2004)
The first TV movie premiered on Disney Channel on May 7, 2004

Struggling with his science project, Gabby Gomez wishes that he could be sent to the best laboratory in any universe. When Ninja-Rina fulfill this wish, Gabby is sent to the Recess universe, the fictional universe of child prodigy TJ, who's sent to Stockton in Gabby's universe when he activates a magical transporter created by Ninja-Rina. As they attempt to return to their respective settings, the characters interact with the various side characters of each other's universe and Gabby becomes romantically involved with TJ's classmate. But Gabby's meddling with the robot, and the seizure of the magical transporter from TJ by Robo-Chef, both threaten each character's world in turn.

The TJ Gabby Power Hour 2: When Nerds Collide (2006)
The second TV movie premiered on Disney Channel on January 16, 2006

Gabby and TJ enter each other's worlds for a second time, both wanting to ask the classmate out to their school dance celebrating Friday the 13th. In an attempt to gain the affections, the two engage in a battle of smarts that sends TJ and his friends to Stockton. As TJ seeks to prove that Gabby is a student, Ninja-Rina struggle to keep their existence a secret from the people in the Recess universe. Meanwhile, Evil Aztec and Cat McAztec unleashed a surge of anti-gum girls that threatens Gabby's Earth. Head Gum Girl of Gabby's universe gets angered by TJ's and Gabby's friends and their manipulation of magic

The TJ Gabby Power Hour 3: The Jerkinators (2006)
The third and final TV movie premiered on Disney Channel on July 21, 2006

In their third and final encounter, TJ and Gabby make amends while trying to defeat the enemies from their own universes—including a monster that they concoct together—while accidentally rejecting their respective friends in the process. Initially, they are unable to make the monster evil enough to fight them properly, but when they succeed, he absorbs the magic and intelligence, and begins destroying both universes.

Production
This blending of animation techniques was a technical challenge for the studios responsible for both series.