4x1 - Beau Tie

November 22, 2002

Dee-Dee has a new boyfriend who also likes science and Einstein, and soon the boy finds himself caught in a vicious tug of war...

4x2 - Remember Me?

November 22, 2002

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

4x3 - Overlabbing

November 22, 2002

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.

4x4 - Sis-Tem Error

April 25, 2003

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

4x5 - Bad Cable Manners

April 25, 2003

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

4x6 - Dexter's Library

April 25, 2003

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

4x8 - Monstrosi-Dee Dee

May 2, 2003

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

4x9 - Dad Man Walking

May 2, 2003

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

4x10 - Dexter's Little Dilemma

May 9, 2003

Dexter accidentally shrinks his parents, and puts them into a model of there house. Although the house isnt completed, so Dexter must find a way to reverse it before they know the truth.

4x11 - Faux Chapeau

May 9, 2003

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

4x12 - D²

May 9, 2003

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

4x13 - Head Band

May 16, 2003

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

4x14 - Stuffed Animal House

May 16, 2003

Dee Dee's stuffed animals come to life and roam the house. Dee Dee and Dexter must get them before Mom and Dad find out.

4x15 - Used Ink

May 16, 2003

Dexter creates an ink in which lets him command them to do whatever he wants them to do. Although when Mandark gets a hold of it, Dexter is the one being the slave.

4x16 - School Girl Crushed

May 23, 2003

Decxter and Mandark are both outperformed by a new girl attending the school, jealous, they become allies to deal with her.

4x17 - Chess Mom

May 23, 2003

Mom thinks she should spend quality time and watch Dexter in his chess comatition. Although, she really embarasses Dexter while hes there...

4x18 - Father Knows Least

May 23, 2003

Dad gets fired from his job, and has to do the same job Mom does. He realises it isnt as easy as it looks.

4x19 - Dexter the Barbarian

May 30, 2003

Dexter goes on a quest. His quest is to reach the bathroom before he explodes.

4x20 - Tuber Time

May 30, 2003

When Dexter realises the power of the potato, he redesigns his lab to work on it.

4x21 - Sore Eyes

May 30, 2003

Dexter is tired of wearing glasses, so he uses laser surgery on his eyes to make him have 1/20 vision. Although, he learns than no human should be able to see THIS well...

4x22 - Babe Sitter

September 5, 2003

Dee Dee goes over to Mandark's house to baby sit him, and Mandark likes that idea.

4x23 - Mountain Mandark

September 5, 2003

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

4x24 - 2Geniuses 2Gether 4Ever

September 5, 2003

Dexter decides its better if him and Mandark work together, although in the end Dexter does all the work while Mandark does nothing

4x25 - Height Unseen

September 12, 2003

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

4x26 - Bygone Errors

September 12, 2003

This takes place in the future, where Old Man Dexter tells about his ""glory days"". And Old lady Dee Dee keeps on adding her opinions as well...

4x27 - Folly Calls

September 12, 2003

When Dee Dee accidentally chops off her pigtail, Dexter gives her some hair growth potion. Although when she uses it, her hair floods the entire house.

4x28 - Voice Over

September 19, 2003

When Dexter's Computer gets Laryngitus, Dexter must find a replacement voice for her.

4x29 - The Blonde Leading the Blonde

September 19, 2003

Dexter refuses to see that blonde's have more fun, so he dyes Dee Dee's hair to prove it.

4x30 - Comic Stripper

September 19, 2003

Dexter finds out that all of Mandark's plans are taken from a comic book. This way, he can get ready.

4x31 - Tee Party

September 26, 2003

Dexter and his dad enter a Golf tournament, with Dad eager to get his hands on the Trophy, but there is one problem: he is hopeless at Golf, so Dexter decides to help with a remote controlled Golf ball

4x32 - Dexter's Wacky Races

September 26, 2003

Dexter, Monkey, The Justice Freinds, Dee-Dee, her imaginary freind Coosie, Mandark, his parents, and Dexter's Parents participate in a cross-country race

4x33 - The Lab of Tomorrow

November 4, 2003

Monkey narrates a documentry of the future of Laboratories and sciences.

4x34 - Chicken Scratch

November 4, 2003

4x35 - Garage Sale

November 4, 2003

Dexters parents accidentally sell Dexter's latest invention, and it is bought by Mandark.

4x36 - They Got Chops

November 20, 2003

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

4x37 - Poetic Injustice

November 20, 2003

Dexter falls in love with a new girl at his school, but decides to impress her with poetry rather than science.

4x38 - Comedy of Feathers

November 20, 2003

When Dee Dee sees an Ostrage at the Zoo, she wants one of her own as a pet.