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"End of the World" (Season 4, episode 6)
An early episode established that Pawnee in the '70s was briefly overtaken by a cult devoted to a giant lizard god called Zorp. This one involves one of the Zorpies' periodic vigils to hail the apocalyptic arrival of their deity, but rather than a farce, it's one of the series' more wistful episodes, as different characters ponder what they might do if this was really their last day on earth. This happens most literally with April helping Andy work through his bucket list until they end up far from Pawnee, but also involves death-phobic Chris becoming interested in the idea of reincarnation, while Leslie has to accept the end of her relationship with Ben so that he can be free to date Shauna Malwae-Tweep.