"Treehouse of Horror XVII" is the fourth episode of The Simpsons' eighteenth season, and the seventeenth Treehouse of Horror episode. It originally aired on the Fox network in the United States on November 5, 2006. In "Married to the Blob", Homer eats green extraterrestrial goo and morphs into a rampaging blob with an insatiable appetite; in "You Gotta Know When to Golem", Bart uses Krusty's golem to wreak havoc on his tormentors; and in "The Day the Earth Looked Stupid", the residents of an early-1930s Springfield refuse to believe news of an actual alien invasion after being duped by Orson Welles' War of the Worlds radio broadcast.