Barbie: Mermaidia [DVD]
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When Elina tells her of the kidnapping, Nori insists on going to rescue the prince herself (mainly because she was very sore that Elina brought the fire birds with her to the cove last time). She'll need the help of Nori, a headstrong mermaid who doesn't trust outsiders and wants nothing to do with Elina.
Nori however, recognizes the cave and sees it as the right path to the location they saw in the Mirror of the Mist when it showed them Nalu. The plot focuses on Elina and other fairy apprentices who are chosen for the annual "Flight of Spring" to create the first rainbow of the season using magic. She assures Elina that it’s possible to make it through by properly timing one’s passage with the eruption of the vents, having done it before, and leads them through.
It premiered on Nickelodeon on March 5, 2006,  and it was later released to VHS and DVD on March 14, 2006. She is soon sought out by a juvenile sea-butterfly fairy who witnessed Nalu, the merprince Elina had befriended in the previous movie, being kidnapped by several of Laverna's goblin-like Fungi at the Crystal Cove.
They succeed, with Elina snatching the Berry and leaping out of the water at the top of a waterfall just as her final blue pearl is in the process of turning white again.
In truth, Topaz really has been kidnapped by Laverna, the evil twin sister of Fairytopia's benevolent ruler, the Enchantress. Nori presses onward, telling Elina to wait for her, but is soon entrapped by the fronds of one of the hostile sea plants growing on the shaft’s walls and starts yelling to Elina for help. When Elina and Bibble are at one of the Merfairies' houses, the Merfairy grabs Elina a plate of food with brown handles on the sides, but they disappear in an overhead shot.