Though the The Simpsons is itself a fictional show of fictional characters, there are also several characters within the show's universe who are fictional to the Simpsons characters themselves (see show-within-a-show).
These include characters from TV and movies, as well as characters who appear on Simpsons halloween episodes, which do not follow the show's continuity.
Happy Little Elves
The Happy Little Elves were an animated cartoon within the fictional Simpsons universe. They were crudely animated green elves in simplistic plots aimed at very young children. They starred in several straight-to-video movies. Baby Maggie Simpson was a fan, to the disgust of her older brother Bart Simpson. They were referenced in the early seasons of the show but dropped in later seasons.
- The Return of the Happy Little Elves — The Tracey Ullman Show short
- The Happy Little Elves Meet the Curious Bear Cub — "Some Enchanted Evening" (May 13, 1990)
- The Happy Little Elves in Tinkly-Winkly Town — "Saturdays of Thunder" (November 14, 1991)
- The Happy Little Elves Meet Fuzzy Snuggleduck — "Homer Alone" (February 6, 1992)
The character of Hugo, Bart's evil twin, was introduced in the "Treehouse of Horror VII" episode of The Simpsons (airdate November 27, 1996). (Halloween episodes are not part of series' continuity.) In this episode, Bart and Lisa discover he has an evil twin brother who is living in their attic. Bart and Lisa investigate, but accidentally set Hugo free. When Bart's parents, Marge Simpson and Homer Simpson, get there, they immediately call Dr. Julius Hibbert, who explains Hugo's origin as Bart's evil conjoined twin. The adults leave to search for Hugo. Bart volunteers to stay home, thinking that would be the safest place for him. But a few minutes later he is captured by Hugo. The insane Hugo has a plan to sew himself and Bart back together, but is rescued by Marge, Homer, and Dr. Hibbert. Then Dr. Hibbert realizes that Hugo isn't the evil twin, it's Bart. Bart is then banished to the attic while Hugo is welcomed back to the family.
Itchy & Scratchy
See Itchy & Scratchy.
Kang and Kodos
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. They claim to be brother and sister. Their primary appearances are in the various "Treehouse of Horror" episodes, but they (or others of their race) have several cameos.
Kang is voiced by Harry Shearer, while Kodos is 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; Kang was a Klingon captain, and Kodos the Executioner was a human villain.
Malibu Stacy is a doll for young girls, comparable to a Barbie doll. On the show, Waylon Smithers of the Springfield Nuclear Power Plant owns the largest collection of Malibu Stacey dolls in Springfield. An attempt was made by Lisa and the original designer to break Malibu Stacey's stranglehold on the doll market. The duo created a new doll with a more believably-sized body and less sexist catchphrases, and called it Lisa Lionheart. The effort was foiled by the appearnce in the stores of a brand new Malibu Stacey With A Hat.
See McBain (The Simpsons).
See Radioactive Man.