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The Worst Episodes of Dexter's Laboratory

Every episode of Dexter's Laboratory ranked from worst to best. Explore the Worst Episodes of Dexter's Laboratory!

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Dexter, a boy-genius with a secret laboratory, constantly battles his sister Dee Dee, who always gains access despite his best efforts to keep her out, as well as his arch-rival and neighbor, Mandark.

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Episode Rankings

  1. #1 Worst Episode
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    Dexter's Laboratory Season 3 Episode 3 - Sole Brother
    5.8/10(141 votes)

    S3:E3

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

    Directors:John McIntyre, Chris Savino
    Writer:Unknown

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  2. Dexter's Laboratory Season 3 Episode 11 - A Mom Cartoon
    5.9/10(132 votes)

    S3:E11

    Mom spends a day at the supermarket.

    Director:Chris Savino
    Writer:Unknown

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  3. Dexter's Laboratory Season 4 Episode 3 - Overlabbing
    5.9/10(135 votes)

    S4:E3

    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.

    Directors:Chris Savino, Don Judge
    Writer:Clay Morrow

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  4. Dexter's Laboratory Season 1 Episode 15 - Dimwit Dexter
    6.0/10(1 votes)

    S1:E15

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

    Director:Genndy Tartakovsky
    Writer:Unknown

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  5. Dexter's Laboratory Season 1 Episode 18 - The Big Sister
    6.0/10(1 votes)

    S1:E18

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

    Director:Genndy Tartakovsky
    Writer:Genndy Tartakovsky

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  6. Dexter's Laboratory Season 1 Episode 28 - Way of the Dee Dee
    6.0/10(2 votes)

    S1:E28

    Dee Dee teaches Dexter how to live life her way instead of being lonely and purely focused on science.

    Directors:Genndy Tartakovsky, Paul Rudish
    Writer:Unknown

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  7. Dexter's Laboratory Season 1 Episode 29 - The Justice Friends: Say Uncle Sam
    6.0/10(2 votes)

    S1:E29

    Major Glory forces Krunk and Valhallen to tidy up their apartment for his Uncle Sam, who is coming over for a visit.

    Director:Genndy Tartakovsky
    Writer:Unknown

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  8. Dexter's Laboratory Season 1 Episode 31 - Spacecase
    6.0/10(2 votes)

    S1:E31

    To prevent himself from being taken away by aliens for experimentation, Dexter tricks Dee Dee into going instead, but he regrets his decision after realizing how much he cares for her.

    Directors:Genndy Tartakovsky, Rob Renzetti
    Writer:Unknown

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  9. Dexter's Laboratory Season 1 Episode 32 - The Justice Friends: Ratman
    6.0/10(2 votes)

    S1:E32

    To fix their apartment's plumbing, Krunk and Valhallen go to the basement, where they meet Ratman, a diminutive vigilante raised by rats (a parody of Batman).

    Director:Genndy Tartakovsky
    Writer:Unknown

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  10. Dexter's Laboratory Season 3 Episode 9 - The Grand Daddy of All Inventions
    6.0/10(130 votes)

    S3:E9

    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!

    Directors:John McIntyre, Chris Savino
    Writer:Unknown

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  11. Dexter's Laboratory Season 3 Episode 12 - The Mock Side of the Moon
    6.0/10(143 votes)

    S3:E12

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

    Directors:John McIntyre, Chris Savino
    Writer:Unknown

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  12. Dexter's Laboratory Season 4 Episode 9 - Dad Man Walking
    6.0/10(133 votes)

    S4:E9

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

    Directors:Chris Savino, Don Judge
    Writer:Carlos Ramos

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  13. Dexter's Laboratory Season 3 Episode 1 - Streaky Clean
    6.1/10(147 votes)

    S3:E1

    Dexter creates a device to keep his clothes clean.

    Directors:Robert Alvarez, Chris Savino
    Writer:Unknown

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  14. Dexter's Laboratory Season 3 Episode 5 - A Quackor Cartoon
    6.1/10(136 votes)

    S3:E5

    Quackor returns to battle Monkey in Dexter's Lab.

    Director:Chris Savino
    Writer:Unknown

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  15. Dexter's Laboratory Season 3 Episode 13 - If Memory Serves
    6.1/10(141 votes)

    S3:E13

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

    Directors:Robert Alvarez, Chris Savino
    Writer:Unknown

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  16. Dexter's Laboratory Season 4 Episode 4 - Sis-Tem Error
    6.1/10(131 votes)

    S4:E4

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

    Directors:Chris Savino, Don Judge
    Writer:Mark O'Hare

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  17. Dexter's Laboratory Season 4 Episode 7 - The Scrying Game
    6.1/10(133 votes)

    S4:E7

    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...

    Director:Chris Savino
    Writer:Mike Stern

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  18. Dexter's Laboratory Season 4 Episode 12 - D²
    6.1/10(129 votes)

    S4:E12

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

    Directors:Chris Savino, James T. Walker
    Writer:Mark O'Hare

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  19. Dexter's Laboratory Season 3 Episode 7 - Copping an Attitude
    6.2/10(136 votes)

    S3:E7

    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.

    Directors:John McIntyre, Chris Savino
    Writer:Unknown

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  20. Dexter's Laboratory Season 4 Episode 8 - Monstrosi-Dee Dee
    6.2/10(136 votes)

    S4:E8

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

    Directors:Chris Savino, Don Judge
    Writer:Gabe Swarr

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  21. Dexter's Laboratory Season 3 Episode 2 - A Dad Cartoon
    6.3/10(140 votes)

    S3:E2

    Dad decides to give the car a retouch.

    Directors:John McIntyre, Chris Savino
    Writer:Unknown

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  22. Dexter's Laboratory Season 3 Episode 4 - Mind Over Chatter
    6.3/10(131 votes)

    S3:E4

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

    Directors:Robert Alvarez, Chris Savino
    Writer:Unknown

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  23. Dexter's Laboratory Season 3 Episode 8 - A Failed Lab Experiment
    6.3/10(130 votes)

    S3:E8

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

    Director:Chris Savino
    Writer:Unknown

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  24. Dexter's Laboratory Season 3 Episode 10 - Poppa Wheely
    6.3/10(129 votes)

    S3:E10

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

    Directors:John McIntyre, Chris Savino
    Writer:Unknown

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  25. Dexter's Laboratory Season 4 Episode 6 - Dexter's Library
    6.3/10(129 votes)

    S4:E6

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

    Directors:Chris Savino, Don Judge
    Writer:Mark O'Hare

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Worst Episodes Summary

"Sole Brother" is the worst rated episode of "Dexter's Laboratory". It scored 5.8/10 based on 141 votes. Directed by John McIntyre, Chris Savino and written by Unknown, it aired on 11/16/2001. This episode scored 0.1 points lower than the second lowest rated, "A Mom Cartoon".