!!Hell Toupee
Snake is arrested for smoking inside the Kwik-E-Mart. Chief Wiggum explains that this is Snake's third strike, so he will be executed in accordance with the three strikes law. Before hauling Snake away, Chief Wiggum helpfully points out that Apu, Moe, and Bart are all witnesses; Snake vows to kill all of them. Snake is executed in the electric chair on World's Deadliest Executions, hosted by Ed [=McMahon=] and proudly broadcast on Fox. Chief Wiggum then sends the body to the hospital to be carved up for organ donations and Barney calls out "dibs on the liver". Shortly afterward, Homer visits Dr. Nick, who transplants Snake's hair onto Homer's head. When Homer goes to sleep the following night, it plants its roots in Homer's brain. With the hair controlling his mind, Homer murders Apu by stuffing him in his own Squishee machine. The next day, Homer goes to Moe's Tavern, where he removes Moe's heart with a corkscrew. Bart realizes that the other two witnesses have been killed, and Homer vows to protect him. Homer locks himself and Bart in a room, but Snake's hair takes control of him. Homer starts to try to kill Bart with a sledgehammer. Bart begs Homer to fight the hair and, after a struggle, Homer rips the hair off his head. The hair tries to smother Bart (like the [[Franchise/{{Alien}} Facehugger]]) but Homer helps his son by punching the hair. Bart quickly shouts out "that's my face, you idiot" Homer gets enraged and does the trademark "why you little..!" and strangles Bart. Wiggum bursts through the door with the intention of arresting Homer for the murder of Moe (not being able to say Apu's last name he settled for just the murder of Moe). Homer states the hair is the killer, which makes a jump for the window. The cop opens fire and the hair is shot dead. Maggie picks up the hair and lays her head on it as a cushion. Chief Wiggum states "now that's a bad hair day" every one laughs at the joke except Marge who reminds everyone that two well known people of Springfield have been murdered, only to suddenly get the joke,and everyone laughs until the end of the segment.
!!The Terror Of Tiny Toon
Marge forbids Bart and Lisa from watching the ''Itchy And Scratchy'' Halloween special, even going to the lengths of taking the batteries out of the remote control. When Marge leaves, Bart finds a small piece of highly unstable plutonium in Homer's toolbox and hammers it into the remote's battery slot. When they use the remote, the kids actually enter the world of Itchy and Scratchy after they accidentally press the Enter button while Lisa tries to get the remote control from Bart and tells him to "Quit it!". They watch Itchy decapitate Scratchy and use his head as a jack-o'-lantern. While the two laugh, Scratchy's head asks why Bart and Lisa are laughing to which Itchy replies that they are laughing at his pain. Because of this, Scratchy reattaches his head and forms a partnership with Itchy to "teach them a lesson". Back in the Simpson house, Homer enters the living room and watches the show. Bart and Lisa go through life-death situations such as being in a police car with Itchy and Scratchy being the police, Itchy lighting up a cannon while Scratchy loads it with various weapons. Homer decides to change the channel, and Bart, Lisa, Itchy and Scratchy wind up on ''Live With Regis And Kathie Lee''. Afterward, they end up back at Itchy's house and urge Homer from inside the TV to use the remote to get them out. While Homer is figuring out which button to press, Itchy and Scratchy unleash a hose full of piranhas at Bart, which eat away at his body until it is a skeleton. Homer finally picks the right button and zaps them both out and Lisa then presses the rewind button to return Bart's body to normal. Unfortunately, Itchy and Scratchy also escape from the TV into the real world, armed with axes. At first, the family is scared, but realize how small the two characters are (the size of a regular mouse and cat respectively) and decide to keep them as pets. Itchy ends up in a hamster cage and Scratchy has fallen in love with Snowball II. However, much to his terror, Marge says he has to be neutered.
!!Starship Poopers
Marge discovers Maggie's first baby tooth, which appears to be a sharp fang. Maggie later loses her legs and grows green tentacles. Maggie's pacifier sucks contact the alien duo, Kang and Kodos. They arrive at the Simpson house, coming to retrieve Maggie. Marge reveals that Kang is Maggie's real father and Homer calls Marge an intergalactic space hussy. Marge retells the story: Kang and Kodos abducted her while she was doing laundry, selecting Marge for a cross-breeding program. She says the aliens used mind-control techniques on her. In realtiy, the entire process consisted of Marge and Kang sitting on a couch, Kang quoting terrible pick-up lines only to suddenly pull a "look-over-there" and use a ray which impregnates Marge as she looks. She recalls that nine months after the abduction, Maggie was born. Kang and Kodos demand that the Simpsons give Maggie to them, and Kang and Homer start to fight over Maggie until Bart stops them and tells them there's only one place where something this bizarre can be resolved: ''The Jerry Springer Show'', where Kang gives Marge a bouquet of flowers and Homer attacks him. When an audience member criticizes Kang for not manning up and being a real father to Maggie, Kang vaporizes her. During Jerry's "final thought," Maggie attacks Jerry Springer (resulting in him dying) and Kang and Homer continue fighting. After leaving the studio, Kang and Kodos threaten to destroy every politician in Washington unless given Maggie. Marge and the Simpsons slyly imply that the aliens could not possibly destroy every politician, and as they fly off to do so (with Bart adding to get Kenneth Starr).

!!This episode contains examples of: ([[YMMV/TheSimpsonsS10E4TreehouseOfHorrorIX YMMV Examples here]])
* AnimatedActors: Hinted to be the case with Itchy and Scratchy during "The Terror of Tiny Toon"
* ArsonMurderAndJaywalking: The three strikes Snake was executed for were: setting fire at an orphanage; blowing up a busful of nuns; and smoking at a Kwik-E-Mart.
* CaptainObvious:
-->'''Lisa''': Of course, somehow Snake's hair is controlloing dad and making him-
-->'''Marge''': [[LampshadeHanging Oh Lisa, everybody already figured that out a while ago.]]
* EyePop: In "The Terror of Tiny Toon" where Bart and Lisa are caught inside ''Itchy & Scratchy'''s show.
* MediumBlending: In "The Terror of Tiny Toon", Bart, Lisa, Itchy and Scratchy fall into the live action "Live With Regis & Kathie Lee" (as it was then titled) show. Regis Philbin and Kathie Lee Gifford both appear as themselves.
* RogerRabbitEffect: In "The Terror of Tiny Toon", when Bart and Lisa end up in "Live With Regis & Kathie Lee".
* RuleOfThree: Snake was executed because of the three strikes law. Also, as usual, the treehouse of horror had three stories.
* ThisTropeIsBleep: The fact that "Starship Poopers" features ''The JerrySpringer Show'' says it all.
* WhatCouldHaveBeen: In "The Terror of Tiny Toon", Bart and Lisa were originally going to end up on ''Series/AllyMcBeal'', but that ended up being dropped when Calista Flockhart backed out at the last minute (which explains the live action portion with Regis Philbin and Kathie Lee Gifford).
* YourMom: In "Starship Poopers", Kang delivers one of these to Homer while on The JerrySpringer Show.
--> '''Kang''': Well (bleep) you hyperbolic parabaloid (bleep) yo mama!