S21E04The Simpsons season 21 episode 4: Treehouse of Horror XX
Aired 18 October 200923 minRated TV-PG
Where to watch The Simpsons Season 21 in Australia
The Simpsons season 21 is streaming in Australia on Disney+ (subscription, listed for the whole show). You can also buy it on Apple TV from $24.99.
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Availability checked 16 November 2026.
What happens in “Treehouse of Horror XX”
Dial "M" for Murder or Press "#" to Return to Main Menu- Lisa is forced into a Hitchcockian murder scheme by Bart. Don't Have a Cow, Mankind- Springfield is once again overrun by zombies, thanks to Krusty Burger's latest sandwich. There's No Business Like Moe Business- In a Sweeney Todd spoof, Moe bleeds Homer dry to create the perfect microbrewed great beer.
Episode summary: TMDB.
Before you watch
- It is episode 4 of 23 of season 21, so watch episodes 1 to 3 first.
- It runs about 23 minutes.
- Directed by Mike B. Anderson and Matthew Schofield, written by Daniel Chun.
- TMDB users rate it 6.9 out of 10 (32 votes).
The Simpsons trailer
The official trailer for the series (no preview of this episode has been published).
Play video: The Simpsons trailer
Cast and crew of this episode
- Directors
- Mike B. AndersonMatthew Schofield
- Writer
- Daniel Chun
- Guest stars
- Marcia Wallace as Edna Krabappel (voice)Pamela Hayden as Jimbo Jones / Dracula's Wife / Rod Flanders (voice)Maggie Roswell as Wolfman's Wife / Miss Hoover / Helen Lovejoy (voice)Karl Wiedergott as Zombie Nurse / Sergeant (voice)Tress MacNeille as Dolph / Agnes Skinner / Mrs Muntz / The Mummy's Wife (voice)
Credits: TMDB.
More from The Simpsons Season 21
Previous · S21E03The Great Wife Hope11 October 2009
Next · S21E05The Devil Wears Nada15 November 2009Every episode of Season 21The Simpsons episode guide
Episode names, air dates, runtimes, stills and ratings: TMDB. Air dates are the first broadcast anywhere; where it streams is our daily Australian check.