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This episode is considered non-canon and the events featured do not relate to the series and therefore may not have actually happened/existed
Treehouse of Horror XXX is an upcoming episode for Season 31 and the 30th The SimpsonsHalloween special. Al Jean confirmed on Twitter that there will be a 30th Halloween special, which also reveals that there will be a 31st season of the show. It will be the 666th episode. It will also be the fifth episode of the potential 31st season, if the show is renewed and season 30 has 22 episodes like normal. In the meantime, Al Jean has confirmed at least a handful of episodes to go with this in Season 31 (2019-2020).