"Trapper Keeper" is the twelfth episode of the fourth season of the animated television series South Park, and the 60th episode of the series overall. It is the 13th episode in production order of Season 4. It originally aired on Comedy Central in the United States on November 15, 2000. In the episode, a man from the future wants Cartman's new Trapper Keeper, while Mr. Garrison's kindergarten class holds an election for class president with confusing results. The Trapper Keeper storyline is an allusion to the Terminator films as well as the anime movie Akira. The subplot with the class president election is a parody of the 2000 United States presidential election and the controversy surrounding its outcome. Kief Davidson plays a guest role, voicing the kindergarteners.
Plot
While waiting for the school bus, Kyle shows his friends his new Dawson's Creek Trapper Keeper. He is joined by Cartman who reveals he has a special, advanced Dawson's Creek Trapper Keeper Ultra Keeper Futura S 2000, which has incredibly advanced computerized features including a television, a music player with voice recognition, OnStar and the ability to automatically hybridize itself to any electronic peripheral device. Kyle accuses Cartman of having purchased it to make him envious. On the bus, a mysterious white man calling himself "Bill Cosby" asks about Cartman's Trapper Keeper, which the man then attempts to steal. He succeeds by buying Cartman's trust, despite Cartman saying "I'm not supposed to have male friends over 30; I kinda got screwed over on that once." When "Bill Cosby" is caught by Officer Barbrady and Cartman, he explains his actions: the Trapper Keeper binder is destined to gain sentience and hybridize into a supercomputer to conquer the world in the future, and wipe out all traces of humanity. Cosby himself is a cyborg from the future named BSM-471, sent back in time to destroy the binder before it could rise to power; Cosby manages to destroy it, but Cartman buys another one and refuses to allow it to be destroyed.
Meanwhile, Mr. Garrison has been demoted to teaching kindergarten, and his students holds an election for class president. Kyle's brother Ike has been admitted to kindergarten two years early because of his supposed intelligence (despite not being able to speak properly). Ike is chosen by Mr. Garrison to run against a boy named Filmore, resulting in a tie that is broken by the vote of a little girl named Flora. Flora is indecisive at first but eventually chooses Ike; Filmore's supporters demand recounts and then call in Rosie O'Donnell, his aunt, who protests the results. After teams of lawyers get involved, filing masses of paperwork and holding protracted meetings, Filmore concedes the election because, according to him, "this game is stupid." With the dispute settled, the class decides to fingerpaint, much to Garrison's delight.
While this is happening, Stan, Kyle and Kenny accompany their robotic companion to Cartman's house to convince his mother to help them, but she goes off with Bill Cosby to have sex. Meanwhile, Cartman's Trapper Keeper integrates itself into Cartman's computer and most of his belongings, and then absorbs Cartman himself. Cartman is transformed into a giant, cybernetic blobby monster that retains most of Cartman's features, similar in style and execution to the movie Akira. It kills Kenny and destroys the house, and sets off to Cheyenne Mountain to absorb the secret military base's computer. Bill Cosby warns that if the Trapper Keeper assimilates with the supercomputer at Cheyenne Mountain, it will become unstoppable.
Kyle sneaks into the huge Cartman-Trapper Keeper hybrid through a ventilation pipe; but before he can disable it, the Trapper Keeper incapacitates him. O'Donnell appears in front of the Trapper Keeper and yells at it for blocking the road. The Trapper Keeper then absorbs her, but fusing with her ultimately makes the behemoth sick. Kyle is freed and disconnects the Trapper Keeper's CPU, causing it to lose power and release Cartman and a now deceased O'Donnell as it collapses. The destruction of the Trapper Keeper causes Bill Cosby to disappear, and Stan tells Cartman to thank Kyle, who just saved his life. Cartman starts to address Kyle, but gets no farther than saying his name before the end credits cut him off.