Princess Merlinda, Sasha, and Nerissa emerge from the sea, embarking on an adventure to stop Pirate Barbarossa's nefarious plan of draining the ocean's magic

The underwater world of Mertropia to follow the adventures of fearless Princess Merlinda and her inseparable friends Sasha and Nerissa. These warrior mermaids embark on an epic journey to the surface world to battle the wicked pirate Barbarossa, who is draining the ocean's magic.