Although "Treehouse of Horror" episodes are Halloween-themed, for several years new episodes premiered in November following the holiday, due to Fox's coverage of Major League Baseball's World Series. Season 12's "Treehouse of Horror XI" was the first episode to air in November. There have been several references to this in the show, such as in Season 15's "Treehouse of Horror XIV" where Kang looks at a "TV Guide" and says, "Pathetic humans. They're showing a Halloween episode... in November!" and Kodos replies "Who's still thinking about Halloween? We've already got our Christmas decorations up!" The camera then cuts to a shot of the fireplace with Christmas decorations, and festive Christmas music plays over the opening credits. Season 21's "Treehouse of Horror XX" aired October 18, before the World Series, but the following year's episode, Season 22's "Treehouse of Horror XXI", aired on November 7. Season 23's "Treehouse of Horror XXII aired on October 30, however, as the World Series (which went the maximum of seven games) had concluded on October 28. Subsequent "Treehouse of Horror" episodes have premiered in the month of October. The 31st season included a Thanksgiving-themed spinoff, "Thanksgiving of Horror". The 32nd season however pushed "Treehouse of Horror XXXI" to November 1, 2020 because the National League Championship Series went into Game 7, with the World Series that followed stretching to Game 6, resulting in Fox airing "Treehouse" after Halloween for the first time since 2010. Citytv in Canada however aired the episode as originally scheduled.