To escape from an arranged marriage to mythical Aquatania's pagan god, Balu, the desperate maiden, Mara, swims to the outside world, only to end up in Tarzan's fishing net. Without delay, Tarzan visits the idyllic secret paradise to right a wrong, and before long, he, too, finds himself before a wicked and well-planned conspiracy, as the island's high-priest, Palanth, is in league with the avaricious pearl trader, Varga, to rob the inhabitants of their precious treasure. Can Tarzan save the mermaid from the barbaric idol's will?
—Nick Riganas