Banned from watching a late-night movie due to his young age, Dexter uses his technology to artificially grow into adulthood, but Dee Dee tampers with his machine, causing Dexter to turn into an old man.

Rerun of "Dexter's Laboratory", the first "What a Cartoon!" pilot.

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

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

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

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.

Mom spends a day at the supermarket.

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

Dexte'rs father begins to sleepwalk, and accidently stumbles into 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!

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...

Dexter creates a device to keep his clothes clean.

Quackor returns to battle Monkey in Dexter's Lab.

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

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.

Dad decides to give the car a retouch.

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

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

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

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

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

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