1. The Pearls of Neptune

When the pearls powering Mertropia start to fade, Princess Merlinda must break the rules and swim beyond her mermaid home to save her father's life force.

2. Pirates' Cove

Nerissa and Sasha look for Merlinda on land. But with her communication bracelet broken, the princess will have to trust her new human friends.

3. Dark Secrets Beneath the School

Celia and Tyler help Merlinda, Nerissa and Sasha adjust to their new school above the surface and try to find answers about their missing map.

4. The Guardian of the Pearls

A whale rescue leads Merlinda and her friends further on their quest to find more pearls — but danger is waiting below the surface.

5. The Haunted Ride

A day at the amusement park proves relaxing — and perilous — when the gang's greatest threat makes an appearance. Alex sets out on his own mission.

6. Danger at Marine Rescue Center

While Merlinda, Nerissa and Sasha use their powers to help Tyler and Celia save the rescue center, Barbarossa and Tempesta concoct a plan of their own.

7. A Volcanic Adventure

The group continues their search for the missing pearls inside a dormant volcano. But Barbarossa is waiting in the shadows to disrupt their plans.

9. A Test for Merlinda

An old foe becomes a friend as Merlinda returns to Pirate Cove to try and save Nerissa, Alex and the pearls. Fred learns the truth about his father.

10. The Power of the Pearls

With a newfound confidence, Merlinda is ready to defeat Barbarossa once and for all. Will she be able to save her friends — and Mertropia?