As Ariel's daughter, Melody, grows, she longs to be a mermaid, though she does not know her mother's past. When she gets her wish, Ariel must find her daughter and save her from Ursula's sister Morgana- before it's too late.
Set some unspecified time after the events of the original film, the film begins with a celebration for Ariel and Eric's newborn daughter Melody (now a niece of Ariel's sisters) on a ship at sea, watched by merpeople and Ariel's six older sisters, Aquata, Arista, Attina, Andrina, Adella, and Alana, now Melody's aunts. Ariel's father, King Triton, presents baby Melody with a magic locket, which is meant to remind her of her mermaid heritage. The party is interrupted by Morgana, sister of the deceased Ursula, who threatens to cause Melody harm, using her as leverage to get Triton's Trident. Ariel and Eric work together to foil Morgana's plan.
Fearing Morgana and remembering what happened with Ursula, Ariel decides to withhold all knowledge of the sea world from Melody. The locket is tossed into the ocean, and a massive wall is built to separate the royal castle from the sea. In the meantime, Sebastian is tasked by Triton to watch over Melody. Flounder and King Triton return to Atlantica.
Twelve years later, Melody remains unaware of her mother’s mermaid heritage and is banned from ever going into the sea. In However, she has been sneaking out the castle regularly to swim and one day finds the locket and shows it to Sebastian and Scuttle. Seeing her name on the locket, Melody confronts her mother in an explosive argument. Furious, Ariel confronts Melody and warns her not to go into the sea. Angry at her mother's refusal to answer her questions, Melody takes a boat and sails away from home. Her parents soon learn that she is gone, and Triton uses his magic to transform Ariel back into a mermaid to search for Melody.
Melody is lured to Morgana’s lair by her manta rays; Morgana acts courteously to Melody and explains that the locket shows her heritage and she can help her become part of it. Undertow believes that Morgana is lying again, but finds that she has a bottle of Ursula's magic. A drop from the bottle lands on Melody's foot and she is lifted into the air in a green vortex that transforms her into a mermaid, filling her with joy. Melody jumps into the water and begins swimming around to her heart's delight. Undertow gets angry with Morgana for not using the potion to change him back, but Morgana tells him she's still reeling Melody into her plot. Once Melody has calmed down and thanks Morgana for fulfilling her dream, Morgana fakes crying and explains that the spell will only last a few days. The transformation can be made permanent if Melody can get hold of the trident, which she claims was stolen by Triton. However, unbeknownst to Melody, Morgana only wants the trident to make up for her own lack of magical talent. The trident can only be removed from its resting place by a descendant of Triton.
She gets a stone map from Morgana and leaves, signing about her situation. Soon, she accidently crashes into ice and breaks the map, losing any clue how to get to Atlantica. However, she soon meets Tip the penguin and Dash the walrus, who seek to become heroes. She tells them that she needs to get to Atlantica and retrieve the Trident or she'll change back into a human. Tip is untrusting of her, but Dash convinces him to help out Melody as she is depressed by becoming human again. They begin signing and swimming away, bonding with each other.
They eventually get to Atlantica, where Melody temporarily loses sight of Tip and Dash. She then meets three mer-teens (a blonde girl with a purple tail and seashell bikini top, a Hispanic boy with a red tail and a blond boy with a green tail), who want to befriend her (but don't seem to notice her top is not a sea-shell bikini); Melody accidently introduces herself as "Mel-mel" due to stuttering from being attracted to the blonde mer-boy. Dash and Tip find Melody and pull her away, putting her back on track. They sneak into the throne room, where she sees Triton looking (unknown to her) at Melody's baby photo. Triton then leaves, ordering his men to double their efforts to find her. Melody quickly takes the trident and leaves with Tip and Dash, accidently losing her locket. Unbeknownst to Melody, her mother has just arrived and enters the throne room with Triton, where they see the trident is gone and her locket is on the ground. Ariel is confused as to how Melody could have gotten there, but they focus on finding her as she may cause trouble with the trident.
Melody successfully returns to Morgana with the trident, but is shocked to find Ariel arrive in mermaid form; Ariel is also shocked to see Melody is a mermaid as well. Morgana tries to keep Melody's favor by "scolding" Ariel for not telling her daughter about her origins. Ariel tries to apologize and stop Melody, but before she can explain that Morgana is evil, Melody gives the trident to Morgana. With the trident in her grip, Morgana reveals her true intentions. She grabbs Melody and put her behind a wall of ice. She calmly mentions that the spell will wear off by sundown. Morgana uses the trident's magic to lord over the ocean, rising to the surface to gloat. Scuttle, Triton, Sebastian, and Eric arrive, and a battle ensues against Morgana and her minions. Ariel rescues Eric from almost drowning while Sebastian clamps his claws down on the tails of Cloak and Dagger.
Soon, Morgana's spell wears off, and Melody returns to human form. Because she is no longer a mermaid, she begins to drown. Melody is freed with the help of Tip and Dash and an unlucky shark. Morgana puts every sea creature under her spell, forcing Ariel, Sebastian, Flounder, King Triton, Tip, and Dash to bow, but before Morgana is about to revive Ursula and Flotsam and Jetsam with the trident, Melody looks down and sees her feet, and realizes that, as she has reverted back to a human, she is able to escape the spell. She manages to grab the trident and throw it back to Triton by climbing up the cliff on which Morgana is standing and sneaking up on her. When Melody does so, Morgana tries to get the trident back, and throws her off the cliff. Just as Melody fears she is facing death, Dash takes action and goes to Melody's falling point; Melody lands on him safely, surviving the fall. Now having had his trident returned to him, Triton uses it to encase Morgana in a block of ice, which sinks underwater with a picture of Ursula from her kingdom and the icicles began to collapse, trapping Morgana inside.
Melody reunites with her family when Eric takes her from Dash, although she was unconscious again. Melody then comes to seeing her father, holding her in his arms after Ariel told him to bring Melody to her. She then begins to apologize to Ariel, but Ariel says that she and Eric are sorry, and that they should've told her the truth instead of keeping it from her. King Triton offers his granddaughter the option of becoming a mermaid permanently and living with him in Atlantica or living with her parents on land. After looking at her parents (with Ariel giving her a knowing smile), Melody says she has a better idea. The next day, she uses the trident to disintegrate the wall separating her home from the sea and everyone from Atlantica comes to the surface to swim with the locals from the village. Melody bumps into the mer-boy she met before and shyly says hi to him. The humans and merfolk and sea creatures unite in a circle around King Triton, Sebastian, Flounder, Scuttle, Tip, Dash, Ariel, Eric, and Melody. Then King Triton uses his trident's magic to form a rainbow in the sky. As the scene come to a close at the end of the song, Melody giggles.
- Ariel (Jodi Benson)
- Melody (Tara Strong)
- Eric (Rob Paulsen)
- Flounder (Cam Clarke)
- Sebastian (Samuel E. Wright)
- Tip (Max Casella)
- Dash (Stephen Furst)
- Morgana (Pat Carroll)
- King Triton (Kenneth Mars)
- Scuttle (Buddy Hackett)
- Undertow (Clancy Brown)
- Chef Louis (Rene Auberjonois)
- Carlotta (Edie McClung)
- Grimsby (Kay E. Kuter)
For a full transcript of The Little Mermaid II, click here.
- Brave (plotline)
- The Voice of Morgana is the same voice of Ursula