Littlefoot's Adventures of The Little Mermaid II: Return to the Sea is the final Land Before Time/Little Mermaid crossover film planned to be re-edited by yru17. It's unknown if the film will be shown on YouTube.
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 on a ship at sea. Ariel's father King Triton presents baby Melody with a magic locket. 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 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. Twelve years later, Melody remains unaware of her mother’s mermaid heritage and is forbidden from ever going into the sea. However, she has been sneaking out the castle regularly to swim and one day finds her locket. Seeing her name on the locket, Melody confronts her mother in an explosive argument. 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, Cloak and Dagger, and Undertow, and Morgana uses the remains of Ursula's magic to temporarily transform Melody into a mermaid. Morgana says that the transformation will be permanent if Melody can get hold of the trident, which she claims was stolen by Triton. With the help of Tip the penguin and Dash the walrus, Melody successfully returns to Morgana with the trident. Ariel tries to 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 and grabs Ariel with her tentacle and holds her hostage. 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. Melody 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. Triton uses his trident to encase Morgana in a block of ice, which sinks underwater. Melody reunites with her family, and Triton offers his granddaughter the option of becoming a mermaid permanently. Instead, she uses the trident to disintegrate the wall separating her home from the sea, reuniting the humans and the merpeople.
- Stan Marsh, Kyle Broflovski, Eric Cartman, Kenny McCormick, Mo, Ali, Bron, Shorty, Jesse Greenwood, Willy the Whale, Elvis, Randolph Johnson, Nadine, The Goonies (Mikey Walsh, Brand Walsh, Mouth Devereaux, Data Wang, Chunk Cohen, Andy Carmichael, Stef Steinbrenner, and Sloth Fratelli), Rex, Woog, Elsa, Dweeb, Celebi, Scooby-Doo, Shaggy Rogers, Fred Jones, Daphne Blake, Velma Dinkley, Scrappy-Doo, The Vultures (Buzzie, Flaps, Ziggy, and Dizzy), Jiminy Cricket, Zazu, Charlie Barkin, Itchy Itchiford, Jean-Bob, Speed, Puffin, Mickey Mouse, Donald Duck, Goofy, Bugs Bunny, Daffy Duck, Jack Skellington, Oogie Boogie, Carface, Killer, Pete, Lord Rothbart, The Fratellis (Ma Fratelli, Francis Fratelli, and Jake Fratelli), The Machine, and Team Rocket (Cassidy and Butch) guest star in this film.
- Oogie Boogie, Carface, Killer, Pete, Lord Rothbart, The Fratellis (Ma Fratelli, Francis Fratelli, and Jake Fratelli), The Machine, and Team Rocket (Cassidy and Butch) will work for Morgana in this film.
- Like BowserMovies1989's film Pooh's Adventures of The Little Mermaid II: Return to the Sea, this is an NTSC film with NTSC bits from The Land Before Time films, South Park: Bigger, Longer & Uncut, Free Willy 1-3, The Goonies, We're Back! A Dinosaur's Story, Pokémon 4Ever, the Scooby-Doo films, the All Dogs Go to Heaven films, the Mickey Mouse films, A Goofy Movie, An Extremely Goofy Movie, Space Jam, Looney Tunes: Back in Action, and The Nightmare Before Christmas.
- The Land Before Time VII: The Stone of Cold Fire, Scooby-Doo and the Alien Invaders, and The Little Mermaid II: Return to the Sea were all released in 2000.