All episodes Season 21 S21E04 2009-10-18 30 min 1980s Fox

The Simpsons

Treehouse of Horror XX

TV Flash files “Treehouse of Horror XX” as hour 445 of 802 in the TV Flash guide — The Simpsons (1989–present) on Fox, season 21, episode 4, aired 2009-10-18, 30 min.

From the desk

How this hour is filed

This leaf is S21E04: listed hour 445 of 802 in the The Simpsons guide, hour 4 of 23 in season 21. It aired 2009-10-18 (30 min). The listed hour before it is “The Great Wife Hope” (S21E03). Next is “The Devil Wears Nada” (S21E05). Broadcast log — titles and dates, not a plot bible.

The Simpsons — Treehouse of Horror XX (S21E04)

Catalog log

Broadcast listing — not a TV Flash recap.

In the 20th anniversary of THE SIMPSONS annual "Treehouse of Horror" Halloween special, three chilling tales of Halloween horror unwind. First, Lisa becomes livid with Miss Hoover, and in a series of homages to classic Hitchcock sets out for deadly revenge. Next, Krusty's latest fast-food sandwich transforms news anchor Kent Brockman into an enraged zombie and twenty-eight days later, cannibal zombies have overrun Springfield. In the final frightening fable, Homer accidentally falls through a trapdoor in Moe's tavern and impales himself on the pipes of Moe's microbrewery. Moe serves the barflies a glass of delicious beer flavored with Homer's blood and Homer, now half-man, half-brewing apparatus, returns for vengeance.

Viewer FAQ

Where does Treehouse of Horror XX sit in the The Simpsons guide?

S21E04 is listed hour 445 of 802 — hour 4 of 23 in season 21, season 21 episode 4.

When did The Simpsons S21E04 air?

Treehouse of Horror XX aired 2009-10-18 and is listed at 30 minutes.

Where should I start if I am not watching all 800 episodes?

Start with the 1989 Christmas premiere, then a handful of golden-age hours from seasons four through eight. Treat the rest as a library, not a novel.

In the series

Why this series still plays

Watch it as a living joke encyclopedia, not a series you owe from pilot to present. The early years still teach how American satire learned to reset weekly; the later catalog is optional weather. You already speak Springfield. This is how the grammar got written.

The first image is a couch, and then it is not. The Simpsons treats the opening gag as a weekly contract: we will reset the living room, and we will still find a new joke about the country that owns it. Fox put a yellow family on Sunday nights in 1989 after the Tracey Ullman shorts, and the half-hour that followed did not merely popularize adult animation. It installed a shared vocabulary. People who stopped watching still speak Springfield.

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Also in season 21

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