Sis-Tem Error

Leftarrow.png "Overlabbing" Premiere Order
"Sis-Tem Error"
"Bad Cable Manners" Rightarrow.png
Leftarrow.png "Chicken Scratch" Production Order
"Sis-Tem Error"
"Bad Cable Manners" Rightarrow.png
Sis-Tem Error
Season 4, Episode 2a
Episode name reference to/pun on: The term "system error" and the word "sister"
Sis-Tem Error.png
Air date April 25, 2003
Production number 401a
Written by Mark O' Hare
Storyboard by Mark O' Hare
Directed by Chris Savino
Don Judge
Paul Stec (art direction)

Sis-Tem Error is the first part of the second episode in the fourth season of Dexter's Laboratory. It first aired on April 25, 2003. In this episode, Dee Dee shuts Dexter's lab down by accident and must keep her brother from knowing.


Dee Dee is messing around in Dexter's Laboratory and she turns off the main power switch which turns off the entire lab. She needs to hide this so Dexter doesn't figure out that it was her. When Dexter comes in, Dee Dee has to make everything work so he doesn't notice. Dexter calls out a robot and Dee Dee dresses up as one and does everything and Dee Dee also pretends to be Computer by doing shadow puppets on the screen. When Dexter starts catching on, she pretends that it was Mandark (is actually Dee Dee in disguise) who did it. Dexter leaves and doesn't notice a thing (specially Dee Dee). Then the power comes back on and Dee Dee shuts it off again.




  • Dexter doesn't notice Dee Dee turns off the main power switch which turns off the entire lab.

Production Notes

  • Dexter's Laboratory was different with a white scenario. It was colored again by blue in the next episode "Remember Me?".
  • Despite premiering in 2003, this is the first episode produced in 2002 along with "Bad Cable Manners" and "Dexter's Library", though these are not the first-aired episodes, which aired on November 22, 2002.
    • These episodes completed production in April 2002. [1]


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