"Treehouse of Horror 13" is the first episode of the fourteenth season of the American animated television series The Simpsons, and the thirteenth Treehouse of Horror episode. It first aired on the Fox network in the United States on November 3, 2002, three days after Halloween. It is the second Halloween episode to have a zombie related segment, and the last Halloween to have three separate writers credited for writing three stories until "Treehouse of Horror XXXIII". It is also the first Halloween episode to be titled Treehouse of Horror in the opening credits, as all prior Halloween episodes were referred to as The Simpsons Halloween Special. It is the first of these episodes not to have a Roman numeral used in its opening title.