3 years after the events of The Little Mermaid II: Return to the Sea, King Triton has passed, and Ariel has full control of the trident, and her daughter, Melody is having time on sea and land, on land she is human, and in sea, she is a mermaid.
- Melody (Maggie Blue O'Hara): the daughter of Ariel, she is now 16 years old and the main protagonist of the series, in human form, she wears dresses,, while in mermaid form, she either wears pink seashell bra or a green seashell bra, and a pink flower in her hair
- Tip and Dash (Max Casella and Stephen Furst): - Melody's 2 best friends and the "Flounders" of the series
- Sebastian (Samuel E. Wright): -
- Ariel (Jodi Benson): - Melody's mother and queen of Atlantica and now controls the trident
- King Triton (Corey Burton): - comes like Jaga on Thundercats, and informs Ariel not to make the same Mistakes he made.
- Scylla (Angelina Jolie): Main antagonist. She got killed in Season 1 finale.
- Lady Tramaine (Susan Blakeslee) - Scylla's servant, and top spy on the land.
- Cathy Catfish (Cindy Robinson) - Tip and Dash's scout to give Ariel messages.
|Episode Number||Title for the Episode||Synopsis|
|1||Ariel's Sea Dream|
|4||Rise of the Morlocks|
|6||Love of Might|