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In season eight the 'Treehouse of Horror VII' was aired and one of the tails was of Bart and his twin brother Hugo.
Hugo and Bart were conjoined twins but the one of the left was pure evil. So they kept Hugo in the attic his whole life because they thought he was the pure evil twin, it is then revealed that Bart is the pure evil twin so Bart is kept in the attic and Hugo lives with the family.
However, these episodes aren't really considered canon, Hugo is never mentioned again and Bart lives with the family again in the next episode.
What else can I help you with?
Are Bart Simpson and Homer Simpson fictional characters?
Yes. Bart Simpson and Homer Simpson are cartoon characters.
What does bart Simpson eat for breakfast?
Bart Simpson obvliously eats his Shorts for Breakfast.
How do you make a Bart Simpson mask?
Print a picture of Bart Simpson & cut out the eyes.
Why is Bart Simpson sometimes called Woodrow?
Bart Simpson has never been called Woodrow.
How do you become exactly like Bart Simpson?
Bart Simpson is a fictional character, you can't be "exactly" like him.
What does Bart Simpson's evil brother do?
nothing. if you watched the episode you will find hugo (the brother) is not the evil twin bart is.
Who is more famous buzz lightyear or Bart Simpson?
Probably Bart Simpson !
Who is more famous Bart Simpson or Shrek?
Bart Simpson
Who is Hugo Simpson on The Simpsons?
Hugo Simpson is supposedly the Siamese twin of Bart in Tree house of Horror VII. (But Bart doesn't really have a Siamese twin on the real show, just on that tree house of horror episode.)
Who is more famous Bart Simpson or Jack Sparrow?
Bart Simpson
Does Bart Simpson have a brother?
No, he does not. He did have a conjoined twin in a Treehouse of Horror segment, but of course those have no connection to the series as a whole.
Who is more famous Bart Simpson or Pingu?
Bart Simpson
Who is more famous tintin or Bart Simpson?
Bart Simpson
Who is more famous Bart Simpson or Eminem?
Bart Simpson
Who is more famous Bart Simpson or Goofy?
Bart Simpson
Who is more famous Bart Simpson or Bob the Builder?
Bart Simpson
Who is more famous flash Gordon or Bart Simpson?
Bart Simpson
