The WORST episodes of Dexter's Laboratory

Every episode of Dexter's Laboratory ever, ranked from worst to best by thousands of votes from fans of the show. The worst episodes of Dexter's Laboratory!

Sleep tight, America! Your fate lies safely in the hands of Dexter, a child genius who whips up dazzling, world-saving inventions in his secret laboratory. Big sister Dee Dee frequently wrecks his experiments, but his bigger nemesis is Mandark, his brilliant rival at Huber Elementary School. Mom and Dad, of course, have no idea what their little angel is up to.

Last Updated: 11/5/2024Network: Cartoon NetworkStatus: Ended
A Third Dad Cartoon
star
2.98
43 votes

#1 - A Third Dad Cartoon

Season 3 - Episode 25 - Aired 6/21/2002

Dad goes with the kids to play some golf.

Writer: Chris Savino
A Mandark Cartoon
star
3.00
44 votes

#2 - A Mandark Cartoon

Season 3 - Episode 14 - Aired 2/22/2002

Mandark plans another scheme to get rid of Dexter.

Writer: Chris Savino
A Boy Named Sue
star
3.80
44 votes

#3 - A Boy Named Sue

Season 3 - Episode 16 - Aired 3/29/2002

How did a young child called Susan became the being now known as Mandark? Born to free spirits, and with a passionate determination to harness the forces of science for his own ends, this is his story...

Writer: Walt Dohrn
Watch Now:Apple TV
A Quackor Cartoon
star
4.04
48 votes

#4 - A Quackor Cartoon

Season 3 - Episode 5 - Aired 11/16/2001

Quackor returns to battle Monkey in Dexter's Lab.

Directors: Chris Savino
Writer: Chris Savino
Watch Now:Apple TV
My Dad vs. Your Dad
star
4.44
45 votes

#5 - My Dad vs. Your Dad

Season 3 - Episode 37 - Aired 9/20/2002

Both Dexter and Mandark's fathers intercede during another of Dexter and Mandark's petty squabbles, but their effort to get along with one another backfire, and the two also soon engage in a heated fight.

Writer: Cindy Morrow
Watch Now:Apple TV
A Dad Cartoon
star
4.46
57 votes

#6 - A Dad Cartoon

Season 3 - Episode 2 - Aired 11/16/2001

Dad decides to give the car a retouch.

Watch Now:Apple TV
Height Unseen
star
6.00
12 votes

#7 - Height Unseen

Season 4 - Episode 25 - Aired 9/12/2003

Dexter is tired of being short, since his old plan of growing himself didn't work, he decides to make everyone shorter than him.

The Mock Side of the Moon
star
6.59
17 votes

#8 - The Mock Side of the Moon

Season 3 - Episode 12 - Aired 1/18/2002

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

Writer: Clay Morrow
Watch Now:Apple TV
Bygone Errors
star
6.62
13 votes

#9 - Bygone Errors

Season 4 - Episode 26 - Aired 9/12/2003

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...

Writer: Clay Morrow
Momdark
star
6.75
24 votes

#10 - Momdark

Season 3 - Episode 6 - Aired 11/16/2001

Mandark disguises as Mom in order to get into Dexter's Lab.

Writer: Cindy Morrow
Watch Now:Apple TV
Jeepers, Creepers, Where is Peepers?
star
6.77
13 votes

#11 - Jeepers, Creepers, Where is Peepers?

Season 3 - Episode 33 - Aired 7/12/2002

Dexter and Koosy must save Peepers, otherwise the whole land of Koz will disappear.

Directors: David Smith
Writer: David Smith
Watch Now:Apple TV
Dos Boot
star
6.93
14 votes

#12 - Dos Boot

Season 3 - Episode 18 - Aired 6/7/2002

Mandark gets in Dexters computer raving havoc, so Dexter must stop him.

Writer: Walt Dohrn
If Memory Serves
star
6.93
15 votes

#13 - If Memory Serves

Season 3 - Episode 13 - Aired 2/22/2002

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

Writer: Cindy Morrow
Watch Now:Apple TV
Dexter's Library
star
6.94
48 votes

#14 - Dexter's Library

Season 4 - Episode 6 - Aired 4/25/2003

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

Writer: Mark O'Hare
Watch Now:Apple TV
Glove at First Sight
star
7.00
13 votes

#15 - Glove at First Sight

Season 3 - Episode 27 - Aired 6/28/2002

Mom and Dad recall the moments that got them together.

Writer: Cindy Morrow
Watch Now:Apple TV
The Big Sister
star
7.06
31 votes

#16 - The Big Sister

Season 1 - Episode 18 - Aired 6/2/1996

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.

Monstrosi-Dee Dee
star
7.07
45 votes

#17 - Monstrosi-Dee Dee

Season 4 - Episode 8 - Aired 5/2/2003

A Monster starts roaming Dexter's lab, although Dexter doesn't know its just Dee Dee, who ate an apple in a failed lab experiment.

Writer: Gabe Swarr
Watch Now:Apple TV
Tele Trauma
star
7.08
13 votes

#18 - Tele Trauma

Season 3 - Episode 15 - Aired 2/22/2002

Tired of missing his favorite TV shows because of studying, Dexter creates a special helmet that absorbs all the TV info.

Blackfoot and Slim
star
7.09
11 votes

#19 - Blackfoot and Slim

Season 2 - Episode 100 - Aired 4/22/1998

A documentary shows the secret lives of Dexter and Dee Dee, also known as Blackfoot and Slim.

Writer: Chris Savino
Remember Me
star
7.10
50 votes

#20 - Remember Me

Season 4 - Episode 2 - Aired 11/22/2002

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

Directors: Chris Savino
Watch Now:Apple TV
The Scrying Game
star
7.12
51 votes

#21 - The Scrying Game

Season 4 - Episode 7 - Aired 5/2/2003

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...

Writer: Mike Stern
Watch Now:Apple TV
Poppa Wheely
star
7.13
15 votes

#22 - Poppa Wheely

Season 3 - Episode 10 - Aired 1/18/2002

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

Writer: Mike Stern
Watch Now:Apple TV
Faux Chapeau
star
7.15
13 votes

#23 - Faux Chapeau

Season 4 - Episode 11 - Aired 5/9/2003

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

Watch Now:Apple TV
Comic Relief
star
7.17
12 votes

#24 - Comic Relief

Season 3 - Episode 24 - Aired 6/21/2002

Dexter creates a special device that lets him create his own life-like superhero comic... along with his sister villain "Deestructa".

Writer: Clay Morrow
Sis-Tem Error
star
7.21
52 votes

#25 - Sis-Tem Error

Season 4 - Episode 4 - Aired 4/25/2003

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

Writer: Mark O'Hare
Watch Now:Apple TV