The Little Mermaid: Beached

Father's day is coming and Ariel is determined to give Triton the best gift ever. Urchin feels bad about not having a father, so Ariel takes him with her to get a rare 'glowing shell' as a gift for her dad. Just as Ariel finds one of the glowing shells, she gets trapped in a cave by a giant octopus. It's up to Urchin to race back to the place for help. Unable to find anyone, Urchin grabs King Triton's trident, which the king carelessly left in the throne room. On Urchin's way back, the trident falls into the fins of the evil Manta.