Meet Misty and the Mermaid Sisters of the Sea!

Misty and her friends are on a very important mission: they must find the six Magic Crystals that give life and strength the Merfolk, and bring them back to Coral Kingdom. But a wicked mermaid named Mantora would like nothing better than to keep the Sisters of the Sea from completing their task. This time she's sent a powerful storm that's blown the mermaids off-course. Can Misty help her...

Racing to bring the magic crystals to the Coral Kingdom, the six young mermaids discover a dolphin trapped in a fisherman's net, thanks to the evil Mantora, and Sophie, the fastest swimmer, rushes off to find help.

Amber leads her fellow mermaids in trying to help beluga whales that are trapped in ice, while working on solving a riddle from evil Mantora, whose theft of the Snow Diamonds may cause the Ice Kingdom to melt.