Dexter and Dee Dee test his latest invention: a device that turns people into animals, which yields crazy results.

When Dee Dee eats an experimental cookie of Dexter's design, she grows extremely tall and makes the city her dollhouse, leaving it up to Dexter to don his giant Robo-Dexo suit and bring her back.

Dexter wants to use his Hydro-Cosmetic Accelerator to age himself enough so he could watch late night television without his parents objecting.

After working himself too hard, Dexter's brain snaps.

When Dexter is attacked by Robots hunting "The one who saved the future", he becomes fascinated by the possibility of what he will be in several years time, taking the Time Machine. Dexter arrives in the future where he finds many things have changed...and that his greatest invention holds the key to total tranquility around the world, but in the hands of evil, also holds the key to total domination of the world

Dexter invents the Rude Removal System, a machine to remove the rudeness from Dee Dee.