Appearing in only one episode out of hundreds, these characters quickly became a part of Simpsons history.
A few notes on this list: In order to be considered, a character can only have appeared in one episode. The only exception is characters who later appeared in nonspeaking background roles. Also, the characters represented are from the first eight seasons only. Sorry, fans of later-season Simpsons.
Guy Incognito
Episode: "Fear of Flying," Season 6
Voiced by: Dan Castellaneta
Quote: "Greetings, good man. Might I trouble you for a drink?"
What made him great: It was a one-note joke but an amazing one nonetheless — with Homer banned from Moe's Tavern, Moe assumed his exact double Guy Incognito was Homer in disguise. In fact, Guy was just a thirsty gentleman with a really unfortunate name.
Via: FOX
Erin
Episode: "Summer of 4 Ft. 2," Season 7
Voiced by: Christina Ricci
Quote: "Yeah. Doing stuff sucks."
What made her great: Erin seemed like someone who would be too cool for Lisa Simpson — and that's exactly what Lisa thought. But once Erin learned the truth about Lisa's nerddom, she continued to stand by her new friend, even helping with a sweet (albeit misguided) redecoration of the Simpsons' car.
Via: FOX
Chester J. Lampwick
Episode: "The Day the Violence Died," Season 7
Voiced by: Kirk Douglas
Quote: "I'm not greedy. As long as I've got my health, my millions of dollars, my gold house, and my rocket car, I don't need anything else."
What made him great: Chester's story was a sad one: It wasn't until he reached the ripe old age of 103 that he got recognition for creating Itchy (and with him, cartoon violence). Though he spent years in poverty, he had expensive tastes. Who wouldn't want a rocket car?
Via: FOX
