Neptune, King of the ocean, sends half-mermaids Emily and Aaron to the land of the midnight sun to investigate the source of the dangerous storms brewing in the ocean.

When Pinkalicious and Peter go to the hidden cove to meet their friend Aqua, a mini-mermaid, they see pirates instead.

With the help of her brother, Jon, nine-year-old Anna daringly seeks to discover the secret means to undo a mermaid's curse upon their grandfather.

When she incurs Neptune's wrath by finding a diamond ring buried under rocks in the ocean, Emily is put under a curse that will force her to choose to be either a mermaid or a human and split up her parents forever.

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.

Uncovering an ancient evil, Serafina, a mermaid of the Mediterranean Sea, searches for five other mermaid heroines who are scattered across the six seas, to save their hidden world.

As Serafina uncovers more clues about the talismans, Neela ventures into a sea dragon's nest, and Ling learns the identity of their foe.

Vacationing in a sleepy beach town for the summer, Sam is pursued by hordes of blonde girls before falling in love with the unusual DeeDee, who compels him to uncover secrets about the community's ocean-dwelling inhabitants.

After being sucked out to sea in a tidal wave, Tristan Hart returns ashore on Coney Island with no memory of what happened to him--yet he can sense the emotions of others and dreams of a terrifying silver mermaid with razor-sharp teeth.

When Splash the merminnie's flashy tricks get him in trouble, it's up to Pinkalicious and her friends to save him.