The 5 Worst Treehouse of Horror Episodes in The Simpsons, Ranked

Every fall, television audiences return to one of The Simpsons’ longest-running Halloween traditions: a new installment of the “Treehouse of Horror” anthology. What began as a one-time experiment in the show’s second season has grown into an annual institution. At its best, the franchise blends sharp comedy with surprisingly effective horror, using three or more short stories to explore everything from classic films to supernatural nightmares. The strongest episodes remain packed with memorable jokes, inventive concepts and genuine chills.

But with “Treehouse of Horror XXXVII” now part of the series’ future, not every entry has lived up to that legacy. The five episodes below rank among the anthology’s weakest, listed from the least disappointing to the most painful to watch. Because these specials are free from normal continuity—and can even kill off major characters—the format offers enormous creative freedom. Unfortunately, these particular installments rarely used it. Instead of delivering the clever scares and lasting laughs associated with the best “Treehouse of Horror” stories, they mostly inspired frustration.

Their failures do, at least, make the classic specials seem even more impressive. Halloween is supposed to come with both treats and tricks, and these episodes represent the trickier side of The Simpsons’ horror anthology.

By the time “Treehouse of Horror XXI” aired in 2010, jokes about the most exaggerated elements of Twilight had already become familiar territory. That left the episode’s “Tweenlight” segment facing an uphill battle from the start. The casting of Daniel Radcliffe as Edmund, a vampire modeled on Edward Cullen, was a clever touch, as was making Count Dracula his father instead of simply recreating New Moon. Still, the premise produced very few memorable jokes.

The lack of inspiration extended across much of the special. An opening sequence that imitates The Office’s famous introduction with classic monsters feels more like a reference than a punchline. The middle story, a parody of Dead Calm, races through so many twists that none of them has time to land. Even the opening tale, in which Springfield is overrun by living versions of familiar board games, offers little beyond a handful of amusing visual gags. Apart from the oddly delayed choice to spoof Dead Calm, the episode seems desperate to remain tied to 2010, leaning on Twilight, The Office and spoiler-related humor that has aged poorly.

Earlier segments such as “Citizen Kang” proved that topical comedy could still be funny long after its original broadcast. “Treehouse of Horror XXI,” by contrast, was underwhelming when it premiered and has done little to improve with age. The decision to build so heavily around Twilight did not benefit The Simpsons.

Over the years, The Simpsons has welcomed an astonishing range of guest stars, including some truly unexpected choices. Few, however, sounded as distracting as Jerry Lewis in “Frinkenstein,” the Treehouse of Horror XIV segment featuring Professor Frink Sr. The problem goes beyond Lewis’ exaggerated delivery and trademark comic mannerisms. His voice sounds strangely distant, almost as if it were recorded in a separate room, making it stand apart from the rest of the cast—including fellow guest stars Oscar De La Hoya and Jennifer Garner.

Casting Lewis as the father of Hank Azaria’s Professor Frink—a character already inspired in part by Lewis—should have been an easy comedic win. Instead, the unusual audio quality overwhelms the segment. The rest of “Treehouse of Horror XIV” does little to compensate. Homer’s transformation into the Grim Reaper generates few lasting laughs, while “Stop the World, I Want to Goof Off” follows a predictable Twilight Zone setup before collapsing into random visual gags that feel like a substitute for an ending.

Even the opening story’s shocking image of Marge shooting Homer with a shotgun cannot make the special especially memorable. The one element that truly lingers is Jerry Lewis’ strangely isolated vocal performance—and that is hardly a compliment.

“The Diving Bell and the Butterball,” from “Treehouse of Horror XXII,” feels like a segment that never decided what it wanted to parody. It begins by spoofing The Diving Bell and the Butterfly before veering into Spider-Man references, leaving the story caught between unrelated influences. Add a steady stream of flatulence humor, and the result becomes an exhausting slog rather than a clever Halloween sketch. As the episode’s opening segment, it immediately highlights the creative stagnation that affected much of The Simpsons around its 23rd season. Although the show enjoyed a brief resurgence after The Simpsons Movie, much of its early-2010s work was frustratingly uneven.

That creative fatigue continues in “In the Na’vi,” a perfunctory parody of Avatar that feels as though it should never have left the drawing board. The story contains little horror and even less Halloween atmosphere, relying instead on predictable references to James Cameron’s blockbuster. A forgettable middle segment casts Ned Flanders as a version of Dexter, once again portraying him as a killer, Satanic figure or werewolf—territory the series had explored with far greater success.

The disappointment is especially striking because “Treehouse of Horror XXII” was written by Carolyn Omine, whose other work on The Simpsons, including “The Way of the Dog,” has shown considerable wit and imagination. None of that spark is evident here. The episode instead stands as a particularly weak example of the broader creative problems surrounding this period of the show.

The Jurassic Park and Jurassic World franchises have produced several underwhelming sequels, so perhaps it was inevitable that The Simpsons’ “Geriatric Park” would also fail to make much of an impression. Featured in “Treehouse of Horror XXIX” in 2018, the segment turns Springfield’s elderly residents into rampaging dinosaurs. The premise is neither frightening nor especially funny, and transforming characters such as Agnes Skinner and Jasper into dinosaurs does not lead to particularly imaginative designs.

“Geriatric Park” offers little that audiences have not already seen in countless Jurassic Park spoofs. The other segments, written by Joel H. Cohen and directed by Matthew Faughnan, fail to rescue the episode. A Lisa-focused parody of Split produces a few laughs, but “Intrusion of the Pod-y Switchers” squanders its own premise with an awkward ending that simply runs out of energy. Rather than closing with a strong gag or a final scare, the story seems to stop because the writers have reached the end of the allotted time.

That sense of minimal effort hangs over “Treehouse of Horror XXIX” from beginning to end. Even the opening story, which brings Homer face to face with Cthulhu, delivers surprisingly few laughs. Against that backdrop, “Geriatric Park” feels like an appropriate finale for one of the anthology’s more disappointing installments.

Some of The Simpsons’ weakest episodes emerged during its 18th and 19th seasons, a period marked by forced attempts at edgy comedy and overly calculated sentimentality. Whether the show’s creative resources were drained by the production of The Simpsons Movie or the series simply entered an unusually sluggish phase, those seasons were difficult stretches. They also produced what may be the low point of the entire “Treehouse of Horror” run: “Treehouse of Horror XVIII.”

Rather than focusing on horror cinema or classic Twilight Zone stories, the special turns to parodies of E.T. and Mr. & Mrs. Smith—concepts that could have appeared in an ordinary episode at any time of year. The Halloween-focused finale, “Heck House,” is somewhat stronger, following Ned Flanders as he uses heavenly powers to teach Springfield’s unruly children about the Seven Deadly Sins. Even so, the idea repeats familiar ground, particularly when Flanders once again takes on a demonic role. The special also brings back Plopper, better known as Spider-Pig, in a brief nod to his Simpsons Movie debut, reinforcing the impression that the episode is recycling recent ideas rather than creating new ones.

That reliance on repetition never produces the distinctive comedy or unsettling surprises that define the best “Treehouse of Horror” installments. Once again, this difficult chapter in The Simpsons’ history left both longtime fans and casual viewers with far less than the Halloween anthology promised.