The episode consists of three segments: "Bad Dream House", "Hungry are the Damned" and "The Raven". In the first segment, the Simpsons move into a haunted house, in the second, they are abducted by aliens and the third is an adaptation of the poem "The Raven" by Edgar Allan Poe. A framing device, in which Bart and Lisa Simpson sit in their treehouse and tell each other ghost stories, gives the episode its name. All of the subsequent Halloween special episodes of the Simpsons also have "Treehouse of Horror" in their title, even though none of them feature a treehouse.