Question: In the Simpsons, Freddy Quimby is the nephew of a character that first appeared in which episode ?

Context articles: Jason Voorhees
Mayor Quimby
Barney Gumble
Zenith (comics)
The Itchy &amp; Scratchy Show
Freddy Krueger
The Boy Who Knew Too Much (The Simpsons)
Troy McClure
They Saved Lisa's Brain
Patty and Selma

Jason Voorhees is the main character from the "Friday the 13th" series.
 He first appeared in "Friday the 13th" (1980) as the young son of camp cook-turned-murderer Mrs. Voorhees, in which he was portrayed by Ari Lehman.
 Created by Victor Miller, with contributions by Ron Kurz, Sean S. Cunningham, and Tom Savini, Jason was not originally intended to carry the series as the main antagonist.
 The character has subsequently been represented in various other media, including novels, video games, comic books, and a cross-over film with another iconic horror film character, Freddy Krueger.
Mayor Joseph Fitzgerald O'Malley Fitzpatrick O'Donnell The Edge Quimby, nicknamed Diamond Joe, is a recurring character from the animated television series "The Simpsons".
 He is voiced by Dan Castellaneta, and first appeared in the episode "Bart Gets an F".
 A member of the Democratic Party, Quimby is the mayor of Springfield, and is a composite parody of U.S. Senator Ted Kennedy and certain other members of the Kennedy family who have entered politics.
Barnard "Barney" Gumble is a fictional character on the American animated sitcom "The Simpsons".
 The character is voiced by Dan Castellaneta and first appeared in the series premiere episode "Simpsons Roasting on an Open Fire".
 He is the town drunk of Springfield and Homer Simpson's best friend.
 His desperation for alcohol is a frequent butt of jokes on the show.
 Barney sobered up in the episode "Days of Wine and D'oh'ses", which was co-written by Castellaneta, and stayed sober for several seasons.
 Barney was inspired by the cartoon character Barney Rubble from "The Flintstones" and by several barflies from other television programs.
 In 2004, Castellaneta won an Emmy Award for voicing various characters, including Barney.
Zenith was a story about a British superhero, which appeared in the British science fiction comic "2000 AD".
 Created by writer Grant Morrison and artist Steve Yeowell, with original character designs by Brendan McCarthy, it first appeared in "2000 AD" #535 (22 August 1987).
 The character Zenith (real name Robert McDowell) first appeared in the second episode - the first episode set the backdrop for his introduction.
The Itchy & Scratchy Show (often shortened as Itchy & Scratchy) is a running gag and fictional animated television series featured in the American animated television series "The Simpsons".
 It usually appears as a part of "The Krusty the Clown Show", watched regularly by Bart Simpson and Lisa Simpson.
 Itself an animated cartoon, "The Itchy & Scratchy Show" depicts a sadistic anthropomorphic blue mouse, Itchy (voiced by Dan Castellaneta), who repeatedly maims and kills an anthropomorphic, hapless threadbare black cat, Scratchy (voiced by Harry Shearer).
 The cartoon first appeared in "The Tracey Ullman Show" short "The Bart Simpson Show", which originally aired November 20, 1988.
 The cartoon's first appearance in "The Simpsons" was in the 1990 episode "There's No Disgrace Like Home".
 Typically presented as 15-to-60-second-long cartoons, the show is filled with gratuitous violence.
 "The Simpsons" also occasionally features characters who are involved with the production of "The Itchy & Scratchy Show", including Roger Meyers Jr. (voiced by Alex Rocco, and, later, Hank Azaria), who runs the studio and produces the show.
Frederick Charles "Freddy" Krueger is a character of the "A Nightmare on Elm Street" film series.
 He first appeared in Wes Craven's "A Nightmare on Elm Street" (1984) as a burnt serial killer who uses a glove armed with razors to kill his victims in their dreams, causing their deaths in the real world as well.
 In the dream world, he is a powerful force and almost completely invulnerable.
 However, whenever Freddy is pulled into the real world, he has normal human vulnerabilities.
 Krueger was created by Wes Craven, and had been consistently portrayed by Robert Englund since his first appearance.
 In the 2010 franchise reboot, he was portrayed by Jackie Earle Haley.
 In 2011, Freddy appeared as a playable character in the video game "Mortal Kombat".
 Over the course of the series, Freddy has battled numerous survivors including Nancy Thompson.
"The Boy Who Knew Too Much" is the twentieth episode of "The Simpsons"<nowiki>'</nowiki> fifth season.
 It originally aired on the Fox network in the United States on May 5, 1994.
 In the episode, Bart runs away from a pursuing Principal Skinner after attempting to skip school.
 During part of his escape, he witnesses an event in which Freddy Quimby, the spoiled nephew of Mayor Quimby, is accused of beating up a French waiter.
 Though the entire town believes that Freddy is guilty, Bart witnessed something else.
 At the trial, Bart testifies for Freddy, claiming that the waiter simply hurt himself because he was clumsy.
 Though attempting to deny the allegations, the waiter proves the truth in Bart's words by falling out the window.
Troy McClure is a fictional character from the American animated sitcom "The Simpsons".
 He was voiced by Phil Hartman and first appeared in the second season episode "Homer vs. Lisa and the 8th Commandment".
 McClure is usually shown doing low-level work, such as hosting infomercials and educational films.
 He appears as the main character in "A Fish Called Selma", in which he marries Selma Bouvier to aid his failing career and quash rumors about his personal life.
 McClure also 'hosts' "The Simpsons 138th Episode Spectacular" and "The Simpsons Spin-Off Showcase".
"They Saved Lisa's Brain" is the twenty-second episode of "The Simpsons"' tenth season.
 It first aired on the Fox network in the United States on May 9, 1999.
 In the episode, after writing a thoughtful letter to the "Springfield Shopper", Lisa is invited to join the Springfield chapter of Mensa.
 When Mayor Quimby later flees Springfield, the group takes control of the town, hoping to improve the lives of Springfieldians through the rule of the smartest.
 Meanwhile, Homer poses for a series of erotic photos.
Patty and Selma Bouvier ( ) are fictional characters in the American animated sitcom "The Simpsons".
 They are identical twins (but with different hairstyles) and are both voiced by Julie Kavner.
 They are Marge Simpson's older twin sisters, who both work at the Springfield Department of Motor Vehicles, and possess a strong dislike for their brother-in-law, Homer Simpson.
 Selma is the elder by two minutes, and longs for male companionship while her sister, Patty, is a lesbian.
 Kavner voices them as characters who "suck the life out of everything".
 Patty and Selma first appeared on the first ever aired Simpsons episode "Simpsons Roasting On An Open Fire", which aired on December 17, 1989.