"Cancelled" is the first episode of Season Seven, and the 97th overall episode of South Park. It aired on March 19, 2003. The boys learn that Earth is a reality show for aliens and must save it from cancellation.
An alien satellite dish is placed in Cartman's butt. Shortly after, the boys are abducted by the aliens that installed it. They find out that the planet Earth is simply an intergalactic reality show. When word gets back to their home planet, the aliens decide to cancel the show. Something must be done.
This episode begins almost identically to the first episode, "Cartman Gets an Anal Probe", with Cartman arriving and talking about a dream where he was abducted by aliens. There are some minor differences from the previous episode such as Cartman calling Ike other names after Kyle tells him not to call his brother a "dildo" and Ike saying more profane statements like "Suck my balls" and "Don't kick the goddamn baby!" When the children realize they're stuck in a "repeat," they and Chef decide to do something about the anal probe Cartman has; they first see a proctologist, then a scientist. Cartman then refuses to activate the satellite unless Kyle is the one who sticks his finger into his ass. Cartman torments Kyle by continually farting, and finally Kyle gets fed up and plugs him. The scientist, called Jeff, discovers that he can reverse the polarity of the message that the alien ship is transmitting by saying one random thing (candy bars) and working his way through Word Association (candy bars usually come in a wrapper, like wrapping a Christmas present; Christmas comes when it's cold, as in Alaska, polar bears live there, and from there the scientist reaches the word "polarity"). A group of Visitors then show up, and the children and Chef flee in Dukes of Hazzard form. However, the children are ultimately abducted.
The kids wake up on the ship, and meet Najix, an alien who looks like Randy Marsh, explaining to them that he chose an appearance that would be most pleasing to them. The disappointed children say it's like the movie Contact which "sucked." He shows his true form, a terrifying monster, so the children have him go through a series of transformations, mostly of celebrities such as Frank Sinatra, George Burns, Jimmy Walker, Michael Jordan, Don King, Mr. Roake and Tattoo from Fantasy Island, and Missy Elliott, until Cartman suggests "a giant taco that craps ice cream". Najix then explains he and the other aliens make a reality show called Earth; all of Earth's species, such as Asians, bears, ducks, Jews, deer, and Hispanics, are taken from seventeen different planets for the purposes of the show, and everyone around the world is unknowingly being filmed and watched. The scientist discovers this at the same time on Earth by translating the binary code that resulted from reversing the polarity of the message (he realized it was binary through more Word Association stemming from "butt sex"); he proceeds to tell everyone, which leads the alien network heads to cancel the show and prepare to destroy the Earth. The scientist concludes that the show is canceled thanks to associating the term "chaos theory" up to "canceled", then uses his Word Association skills with the word "jackets" to come up with a plan to send the ship a computer virus to disable their computers. Chef responds, "That doesn't make any goddamned sense!"
The boys go to Planet Fognl to meet the alien heads, who are "Joozians", a species that control all media in the universe. The aliens don't listen to the boys while explaining that after 100 episodes, series start to decline in sensibility. This is followed by scenes where they insist on taking the boys to lunch, go to a "hekma" (topless) bar, and visit a prostitute's hotel room. The two Joozians then, very drunk and high on "blach", begin sucking on each other's "jagons" and sticking their fingers in each other's "thrushers", actions depicted as being highly erotic and, seemingly, inappropriate. Kenny takes a picture of it, and the boys then blackmail the aliens with it. The Joozians agree to erase everyone's memory of the truth about Earth, then send the oblivious boys back to their own planet. Kenny still has the picture, and though no one can remember what it is, Chef tells Kenny to keep it, as he feels sure that it's something very important. The episode ends with another advertisement for Earth.