Jack, a marine biologist, saves mermaid princess Leora hunted by dark creatures to fulfill his late wife’s ocean-protecting wish and gains the Heart of the Sea that allows him to live underwater. Jealous warrior Karen colludes with the monster Kraken, letting factories dump toxic sewage to erode the ocean’s core. Jack learns ancient purifying magic with Leora, while environmentalists collect evidence against polluters. Humans, mermaids and sea creatures unite, defeat evil with combined magic, wipe out pollution and rebuild a harmonious marine homeland.
