The Little Mermaid II: Return to the Sea is a 2000 animated direct-to-video musical fantasy adventure film produced by Walt Disney Television Animation, and the second installment in The Little Mermaid trilogy. Directed by Jim Kammerud and Brian Smith, the story of the film takes place 12 years after the original, and focuses on Ariel and Eric's daughter Melody, a human princess who longs to swim in the ocean despite her parents' law that the sea is forbidden to her.

Plot

Ariel and Eric celebrate the birth of their daughter Melody on a ship at sea. Ariel's father King Triton presents Melody with a magic locket. The party is interrupted by Ursula's sister Morgana, who threatens to have Melody fed to her pet tiger shark, Undertow, unless Triton surrenders his trident to her. Morgana then announces her plan to use the trident to avenge Ursula and take over the ocean. Ariel and Eric work together to foil Morgana's plan, and Triton shrinks Undertow to the size of a piranha. Morgana escapes, eluding the attempts of King Triton's forces to capture her and declaring that she will someday exact her revenge on both Ariel and Triton and avenge Ursula's death. Fearing Morgana and remembering Ursula, Ariel decides that, until Morgana is captured, they will have to withhold all knowledge of the sea world and her heritage from Melody in order to protect her. Triton tosses the locket into the ocean, and a massive wall is built to separate the royal castle from the sea. Triton assigns Sebastian to watch over Melody.