"Treehouse of Horror XIX" is the fourth episode of the twentieth season of the American animated television series The Simpsons. It first aired on the Fox network in the United States on November 2, 2008 and in the United Kingdom on November 23, 2008. This is the nineteenth Treehouse of Horror episode, and, like the other Treehouse of Horror episodes, contains three self-contained segments: in "Untitled Robot Parody", Transformer robots run amok in Springfield; in "How to Get Ahead in Dead-Vertising", Homer is hired by ad agents to kill celebrities so their images can be used for free; and in a Simpsons-style parody of It's the Great Pumpkin, Charlie Brown (called "It's the Grand Pumpkin, Milhouse"), Milhouse summons a demon pumpkin who goes berserk when it sees humans carving its brethren