High Quality Content by WIKIPEDIA articles! "Treehouse of Horror XIX" is the fourth episode of the twentieth season of The Simpsons. It first aired on the Fox network in the United States on November 2, 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 into jack-o-lanterns as part of Halloween tradition. It was written by Matt Warburton and directed by Bob Anderson.