The frightfest begins in "Mr. and Mrs. Simpson" as Homer and Marge leave for what appears to be an ordinary day. But Homer is living a double life as a secret agent, and he is assigned to eliminate Kent Brockman. When a mysterious woman blocks Homer's shot and tries to kill Brockman herself, Homer finds that his competition "hits" a little too close to home. In "E.T. Go Home," Bart and Lisa come to the aid of Kodo the space alien, who's hiding from the government. Kodo asks them to help him obtain a long list of devices so he can reconnect with his home planet, but his intentions prove to be anything but friendly. In the final Halloween scare, "Heck House," Bart, Lisa and their friends spend Halloween night pulling pranks on unsuspecting people in Springfield. But when they go too far, Flanders decides he's going to spook them straight. Transforming the church into the "Heck House," Flanders is filled with supernatural power and subjects the children to his wrath of seven deadly sins.
FAN DESK VERDICT An all-timer. This is the episode you show someone to explain why The Simpsons matters — clear the evening and watch it properly.
The Simpsons S19E05 (“Treehouse of Horror XVIII”) first aired on November 4, 2007.
In the US, The Simpsons season 19 — including this episode — is available on FX, Hulu, Disney+, fuboTV, DirecTV On Demand, Spectrum On Demand, YouTube TV, FOX One Amazon Channel, Hulu on Disney+, Amazon, Fandango at Home, and AppleTV.
Guest stars include Karl Wiedergott (Additional Voices (voice)), Maurice LaMarche (Screaming Cop (voice)), Pamela Hayden (Milhouse Van Houten / Jimbo Jones (voice)), and Tress MacNeille (Elevator Voice / Agnes Skinner / Plopper (voice)).
The Simpsons S19E05 (“Treehouse of Horror XVIII”) was directed by Chuck Sheetz and written by Marc Wilmore.
Fans rate The Simpsons S19E05 (“Treehouse of Horror XVIII”) 9.1/10, which puts it in the essential tier for The Simpsons.