Warning: Wikipedia contains spoilers

Table of contents
1 Hugo
2 Itchy and Scratchy
3 Aliens
4 Malibu Stacey
5 Radioactive Man

Hugo

The character of Hugo, Bart's evil twin, was introduced in the episode of The Simpsons Treehouse of Horror VII, airdate November 27, 1996. In this episode Bart realizes that his parents lied to him for his whole life because he didn't know he had an evil twin brother who was living in his attic. Bart goes into the attic to see who's living there but he had set Hugo free. Now his family was in big trouble. Well at least that's what they thought. When Bart's parents, Marge Simpson and Homer Simpson, get there they immediately call Dr. Julius Hibbert they in great hurry go to look for Hugo. Bart volunteer to stays home thinking that would be the safest place for him. But a few minutes later he realizes Hugo is sharing the same air as him. Hugo thinks it was cruel to separate him and Bart. So Hugo has an idea, he wants to sew Bart and him back together. When Marge, Homer, and Dr. Hibbert show up and try to avoid Hugo from sewing Bart on to him. Then Dr. Hibbert realizes that Hugo isn't evil, but Bart is.

Itchy and Scratchy

Itchy and Scratchy is a fictional television cartoon show within the television cartoon show The Simpsons. It depicts a cat (Scratchy) and mouse (Itchy) continually attacking and mutilating each other with all sorts of deadly weapons.

"Itchy & Scratchy" is parody of the Tom and Jerry cartoon series (especially the very violent ones which were made during World War II); it is also satire on violence in television programmes aimed at children. Bart and Lisa find the show's extreme violence hilarious, but in one episode their younger sister Maggie imitates the cartoon characters and hits her father Homer on the head.

The fictional series has supposedly been in continuous production since early in the 20th century, first for theater release and then for television. Older Itchy and Scratchy cartoons are occasionally shown satirizing other aspects of early animation; for example a cartoon is shown in one episode of The Simpsons which closely resembles the early Mickey Mouse cartoon "Steamboat Willie".

Itchy and Scratchy is a TV show within a TV show ("Krusty the Clown") within a TV show ("The Simpsons") that itself started as a show within a TV show ("The Tracey Ullman Show").

Lyrics to the Theme Song

They fight,
And bite,
They fight and bite and fight!
Fight fight fight, bite bite bite,
The Itchy and Scratchy Show!

External Link

Aliens

Kang and Kodos are two aliens in all the Treehouse of Horror episodes. Kang and Kodos are seven-foot tall, continually drooling aliens from Rigel 4. Their primary appearances are in the various "Treehouse of Horror" episodes, but they (or others of their race) have several cameos.

Kang was Harry Shearer, while Kodos was voiced by Dan Castellaneta. Another Rigelian, Serak the Preparer, was played by James Earl Jones.

Kang and Kodos are named after two characters from Star Trek.

Malibu Stacey

Malibu Stacey is the doll in the animated series The Simpsons. It is comparable to a Barbie doll. On the show, Waylon Smithers of the Springfield Nuclear Powerplant owns the largest collection of Malibu Stacey dolls in Springfield.

Radioactive Man

Radioactive Man is a comic book superhero. His catchphrase is "Up and Atom!" Fallout Boy is his sidekick.