Simpsons Already Did It

Kyle, Stan and Tweek are making a snowman, when Stan tells Tweek to put the carrot on for the nose. Tweek replies 'But what if when I'm putting on the nose, the snowman comes to life and tries to kill me?' referring to what happened in the short Jesus vs. Frosty.

Cartman shows Kyle, Stan, and Tweek an advertisement he found for "Sea People" (a parody of Sea-Monkeys). Cartman imagines them to be a race similar to mermaids who will "take me away from this crappy goddamn planet full of hippies." He convinces everyone to chip in so they can buy them.

Meanwhile, Butters, in his evil alter-ego persona Professor Chaos, is trying to figure out a way to bring disarray to the town. When he plots to block out the sun, his assistant, Dougie/General Disarray, informs him that it mirrors a plot of Mr. Burns' from The Simpsons and Butters abandons the idea.

Cartman soon begins to prepare for the Sea People, even making a sign to welcome them, but after placing them in the water, Stan reveals that they are simply brine shrimp. Cartman, in a fit of rage, begins to berate his friends, but lightens up after the group decides to place the shrimp in Ms. Choksondik's coffee. The scene then cuts to Ms. Choksondik's house, where she has died and an ambulance is taking away her corpse.

Butters decides to cut the head off of the town's central statue—which mirrors Bart Simpson's decapitation of Springfield's Jebediah Springfield statue. On the news report, the newscaster interprets Butters' vandalism as an homage to The Simpsons; the police are not investigating the crime because they want the statue to remain headless as a tribute.

Upon hearing that semen was discovered in the teacher's stomach, the boys conclude that they killed Ms. Choksondik with their "sea men". They go to the morgue to steal the evidence, fearful that they will "find the women too!" Butters devises increasingly outlandish schemes, but Dougie keeps pointing out that they have already been done on The Simpsons.

Eventually, Chef explains that there is a difference between "sea men/semen" and "Sea People", and that the brine shrimp did not kill their teacher. Cartman then discovers that when the semen they recovered has been added to the Sea People aquarium, it combines with the Brine Shrimp to create an intelligent race of actual sea people.

Trying to come up with an original plot, Butters watches every episode of The Simpsons twice before introducing his newest plan: build a machine that replaces the cherry centers of chocolate covered cherries with rancid mayonnaise (a plot that Dougie/General Disarray dismisses as being too uninspired to appear on The Simpsons). As Butters is about to use his device, a Simpsons commercial announces that Bart will do exactly the same thing in that night's episode. Butters has a nervous breakdown and begins picturing the town in the animation style of The Simpsons.

At the Cartman household, the boys have bought more Sea People, a larger aquarium, and several gallons of semen, including semen Cartman admits he “sucked out of a hose”. Their Sea-Ciety evolves into an ancient Greek-esque civilization, and they begin worshipping Cartman.

Stan and Kyle invite Butters and others to see the aquarium. Butters then states that the Sea-Ciety plot is similar to that of the "Treehouse of Horror VII" short "The Genesis Tub". Though the boys agree with him, they also note that The Simpsons has done everything, so worrying about that is pointless. Chef also points out that they in turn borrowed their ideas from a classic Twilight Zone episode, "The Little People". Butters understands and everyone returns to their normal appearance. Butters then happily leaves, getting ready to wreak havoc once again. The Sea People on the other side of the aquarium begin worshipping Tweek, leading to a holy war. Seconds later they develop nuclear weapons and destroy themselves, like the Futurama episode "Godfellas" (also inspired by the Twilight Zone episode), another show made by Matt Groening. While Kyle concludes war is inevitable, a distraught Cartman wonders, "Why can't societies live in peace?"

"Simpsons Already Did It" was inspired by the fact that The Simpsons did in fact beat South Park to several plot concepts.[2] In the season 4 episode "The Wacky Molestation Adventure", Butters was supposed to block out the sun, but one writer pointed out that "The Simpsons already did it." The episode "calls out" the obvious observation that The Simpsons have realized a vast number of ideas throughout their long-lived run. Some have found a certain reciprocity to this statement, finding instances of repetitiveness in The Simpsons itself while quoting South Park.[3]

The episode is also referenced to the fact that the Fox Broadcasting Company passed on the South Park series, as they hated the idea of the talking poo character, Mr. Hankey, being in the show and fearing that such character would tarnish their network branding. Another reason for the episode's title is that in addition to the disdain for Mr. Hankey, Trey Parker, who co-produced South Park with friend Matt Stone, said that Fox executives told them "It'll never work because adults don't want to watch a show about kids. They want to watch a show about a family", subtly implying that the show premise should be modeled around a family similar to The Simpsons in order to be successful.[4]

The Simpsons crew has a friendly relationship with South Park, which they demonstrated several times, going as far as sending flowers to the South Park studios when South Park parodied Family Guy in the season 10 episodes "Cartoon Wars Part I" and "Part II".[5] In 2010, The Simpsons crew congratulated South Park for reaching 200 episodes, with a message reading "Congratulations on 200 Episodes. (We Already Did It.) (Twice.)".

Soon after, in reference to the controversies and terrorist threats surrounding depictions of the Muslim prophet Muhammad in the South Park episodes "200" and "201", the chalkboard gag on that week's The Simpsons episode, "The Squirt and the Whale", read "South Park – We'd stand beside you if we weren't so scared".[6]

South Park was parodied in a 2003 Simpsons episode, "The Bart of War", showing a scene with three of the South Park boys Stan, Kyle and Cartman drawn in Simpsons style, with Marge disapproving of Bart and Milhouse's apparent enjoyment of "cartoon violence", and the latter two contemplating about adults voicing children's characters. The 2009 Simpsons episode "O Brother, Where Bart Thou?" has Bart, Milhouse, Nelson and Ralph dressed up as, standing at the bus stop – similarly to the iconic bus stop scenes of South Park –, and Otto using the catchphrase "Oh my God! I killed Kenny!" when he hits Ralph (dressed as Kenny) driving the school bus.

The episode received generally positive reviews. Travis Pickett of IGN gave it an 8.5 rating, especially praising Trey Parker and Matt Stone for managing to contrast the episode with the actual Simpsons with themes like Cartman performing fellatio on "some guy in an alley", while respectfully paying their dues.[7]