DC Super Hero Girls: Legends of Atlantis (2018)

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When Mera and Siren, a pair of thieves from the ocean kingdom of Atlantis, steal the Book of Legends from Super Hero High, Batgirl, Supergirl, Wonder Woman, and the rest of the DC Super Hero Girls must recover the tome and return it to its rightful place. the group must combine their powers to journey deep beneath the ocean and pursue the thieves before they locate the Trident of Atlantis and take over the entire ocean.