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"Treehouse of Horror XXX" is an upcoming episode of 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 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).