Since the 1990 debut of the first Halloween special, The Simpsons has produced 36 " Treehouse of Horror
Treehouse of Horror XXVII (S28) – Dry Hard (Mad Max parody with water shortage), BFF R.I.P. (Lisa’s imaginary friend murders).
Treehouse of Horror XXVIII (S29) – The Exor-Sis (Maggie possessed), Coralisa (Coraline parody), MMM… Homer (Homer as a cannibal sandwich maker).
Treehouse of Horror XXIX (S30) – Intrusion of the Pod-Y Switchers (pod people), Multiplisa-ty (Lisa’s split personalities), Geriatric Park (cloned elderly at daycare).
Treehouse of Horror XXX (S31) – Danger Things (Stranger Things parody), Heaven Swipes Right (Homer on a dating app in heaven), When Hairy Met Slimy (Kang/Kodos romance). the simpsons treehouse of horror all seasons verified
The annual "Treehouse of Horror" tradition began in 1990 during Season 2 of The Simpsons Since the 1990 debut of the first Halloween
Treehouse X (S11E4) – “I Know What You Diddily-Iddily-Did” (South Park-style Scream parody), “Desperately Xeeking Xena” (superheroes), and “Life’s a Glitch, Then You Die” (Y2K apocalypse). Verified: Dated humor but fun. Treehouse of Horror XXIX (S30) – Intrusion of
The 666th Milestone: "Treehouse of Horror XXX" famously served as the series' 666th overall episode.