Due to overworking his brain, Dexter's mind shuts down, making him act idiotic.

Rerun of the second "What a Cartoon!" pilot.

Dexter and Mandark drill underground to expand their labs, but end up overlapping each other's work. They secretly devise a plan to destroy each other.

After a failed mutation experiment, Dexter becomes Dee Dee's foot.

Mom spends a day at the supermarket.

Dexte'rs father begins to sleepwalk, and accidently stumbles into Dexter's Lab

Quackor returns to battle Monkey in Dexter's Lab.

Dexter's mom takes him to his grandpa's house. At first he thinks it's going to be a boring day until he discovers that his grandpa has a secret lab!

Dexter travels to the moon and finds aliens that are planning to come to Earth to take everything.

Dee Dee learns a new game that can ""predict peoples futures"". She uses it on Dexter, and finds out that the game REALLY DOES predict peoples futures...

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.

Dee Dee accidentally breaks down Dexter's lab, and she tries to not and let him know its broken.

A Monster starts roaming Dexter's lab, although Dexter doesnt know its just Dee Dee, who ate an apple in a failed lab experiment.

Dexter and Dee Dee realise when they work together, they make a pretty good team.

Dexter creates a device to keep his clothes clean.

Dexter uses a device to listen to what Dad is thinking, but the experiment backfires and everyone else can hear what Dexter is thinking.

Dexter creates a device taht doesn't work the way he wanted.

It's career day and Dexter is ashamed of his Dad so he creates a Dad that looks more like him.

Fearing that his memory might be limited, Dexter uses a device to save all his memories.

When Dexter becomes the head of a library, he inforces the rules really hard, driving everyone crazy.

Dexter creates a new invention and wears it on his head. It suddenly becomes the latest fashion craze at Huber elementry.

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

Dad decides to give the car a retouch.

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

Dad wants cable really bad, so Dexter illegally pirates cable for him.