Overview:United, the Mermaids, humans, and sea monsters figure our how to open the final lock on the well of power, but something goes wrong!
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First Air Date: May 20, 2016Last Air date: Sep 22, 2018Season: 4 SeasonEpisode: 35 EpisodeRuntime: 5:10 minutesQuality: HDIMDb: 10 / 10 by 0 usersPopularity: 0.5331Language: en
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