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: He first meets a timid, cubicle-working version of himself who has lost his scientific spark and works for Mandark.
: He encounters an older, muscular, and battle-hardened Dexter who is actively fighting against a dystopian regime.
: Finally, he finds an ancient, bearded Dexter who possesses ultimate knowledge but has become somewhat eccentric. The Grand Battle
The four Dexters—the child, the wimp, the hero, and the elder—unite to stop , who has successfully taken over the world using the Neurotomic Protocore. Mandark summons his own future versions for a massive showdown. However, just as the Dexters are about to fail at flipping the core's switch to positive, Dee Dee accidentally arrives via the time machine.
Angry that they weren't the "chosen ones," the four Dexters build the very robots seen at the start of the story. They program them to go back in time and destroy "the one who saved the future" (meaning Dee Dee), creating a that leads back to the movie's opening scene.