- “Homer Simpson, you're under arrest for the murder of Moe Syzslak and Apu Nahasa...pasa... er... Moe. Just Moe just Moe yeah Moe.”
- ―Chief Wiggum[src]
"Treehouse of Horror IX", also known as "The Simpsons Halloween Special IX" is the fourth episode of Season 10, as well as the ninth Halloween episode. It was originally going to be the first episode of that season.