Every 100 years, two young merfolk are chosen to protect The Hidden Island, a magical island gifted to the world by the god Poseidon. The island is filled with magical elements, mythical creatures, and secret only the Protectors know about. Their only duty is to make sure only the pure of heart can find it and take only what they need from it. But when something threatens the island, the Protectors are put to the ultimate test to fight and protect their beloved Island. Only the Protectors are capable of such a mission and they must rely on their extensive training and intelligence to keep what must be sacred a secret.