Dexter and Dee Dee label everything in the house. When their parents get home, they mistake Dexter for Dee Dee (he had a Dee Dee label on his forehead), but he already blamed Dee Dee for the chaos.

While at the beach, Dee Dee (who's wearing a mermaid swimsuit) gets captured by a maniac sailor so Dexter must rescue her.

Dexter will do anything to make the ice cream vendor stop to get some ice cream.

Dexter and Dee Dee go to the dumps to retrieve Dee Dee's lost teddy bear.

Dexter and Dee Dee get trapped with a Finger trap.

Dexter uses his science to turn Dee Dee into a horse.

Dexter and Mandark must team up in order to save the Earth from a meteor rain.

After Dexter and Dee Dee destroy Dad's bowling trophy, they are sent to each other's room.

After Dexter breaks his glasses, he starts a new fashion at school.

Dexter must prove to Dee Dee that Santa Claus doesn't exist.

Because of his exceptional grades Dexter's school and parents have decided that he can go to college. At first Dexter is happy to be there so he can fill his mind with college knowledge, but in the end the students influence on Dexter allows him to do college pranks sending him a one way ticket back to Huber Elementary School.

Dexter creates the ultimate robot (RoboDexo 3000) to replace his previous 200 model.

Dexter is hit by a wrench while working on a device, and suffers amnesia, Dee Dee decides to mess with his head

Dee Dee has a song stuck in her head. Literally.

Mandark drops technology and starts being more in touch with nature.

Dexter is tired of being short, since his old plan of growing himself didnt work, he decides to make everyone shorter than him.

Dee Dee starts layin' down the Judo on Dexter, then Dexter learns how to fight back.