When Echo injures her tail, she can't compete in the Poseidon Tail Flippers team competition. Will Echo find a way to help her team win from the sidelines?

Of all the creatures in the ocean, sea horses are Echo Reef's favorite. They're sweet and gentle and they glide through the water so gracefully. When Echo discovers that Rocky Ridge, one of her Trident Academy classmates, has his own pet sea horse, she wants one right away. Not everyone agrees sea horses should be pets, however. Perhaps they are happiest when swimming freely. But Echo thinks that if Rocky can make a sea horse happy, she can too! Can't...

A shark has been spotted in Trident City! Pearl Swamp is so scared, she needs a shark Guard to escort her to and from school. She doesn't trust anyone who likes these terrifying creatures, especially Kiki Coral, who isn't nearly as frightened as Pearl. And to make matters worse, Pearl accuses Kiki of stealing her precious pearl necklace! Will the sharks destroy the peace of their sparking city? Or will the mergirls have to swim in dangerous deep-sea...

When her class at Trident Academy visits a pod of whales, Kiki Coral must overcome her fears with the help of her friends.

While preparing for a unit on storytelling, the mermaids of Trident Academy learn of a legendary pirate treasure in their own city and Pearl decides to find it, despite a warning that it is guarded by a ghost.

Wanting to help a lost baby polar bear return home, Kiki Coral and her mermaid friends worry that the cost of the bear's transportation will prevent them from seeing a concert performance of their favorite boy band.

Shelly, Echo, Kiki, and Pearl are spending their school vacation at Neptune's castle! Shelly's aunt, Queen Edwina, has invited the girls to stay for a whole week, and while they're there the girls can't wait to visit the Royal Orca Museum, see the Palace Library, ride seahorses, and maybe even attend a royal ball. Shelly is nervous about meeting her royal family, especially since she's never felt like a princess. But when she arrives at the castle,...

Mermaid Echo is going to see the under-the-sea band, the Echos. Everyone at Trident Academy is invited except Echo's best friend Shelly.

Shelly Siren loves playing on Trident Academy's Shell Wars team. But is she ready to complete in the Shell Wars Championships in the fintastically famous city of Atlantis? As part of their trip, the mergirls get a tour of Atlantis and swim through Poseidon's Temple where Shelly sees a spookfish, which according to legend, carries a horrible curse.

When her class visits a pod of whales, Kiki Coral must overcome her fears with the help of her friends.