Ariel wants legs so she can dance but no one believe's in her dream. She gets discouraged until she meets another mermaid called Gabriella who wants to sing so they go to a magical starfish who can make their dreams come true.

Ariel wants to learn more about humans, so she goes to a humanalogist who makes her day when he tells her that a human is coming under the sea in a metal submarine shaped like a fish.

Ursula's evil spells haven't been working lately because of a bad luck creature. Ariel finds the creature and brings him home, but Ursula still wants to destroy the bad luck creature and whoever owns him.

Sebastian's old perfect friend from his childhood comes to town. When Sebastian gets angry because he's so perfect, Sebastian becomes a pawn in Ursula's plan to take over the kingdom.

Spot the whale returns and before Ariel and the others can rejoice the circus people take him away to join the act with all the other abused animals.

After overhearing King Triton talk about him Sebastian thinks that he got fired as the King's trusted advisor. He searches for a new job but gets rehired in the end.

King Triton wants Ariel to learn how to play the calliope, but Ariel wants to learn how to play the harp. She tries to learn the calliope and her bad playing wakes up an old ancient evil sea monster.

Ariel laughs at everything, even things serious so a sorceror blowfish cast a spell on Ariel so when she laugh's seaquakes will rise.She gets sick of it so when she meets up with thisblowfish she teaches him the power of laughter.

Sebastian is sad because he's a little crab, so Ariel goes to a cave where she becomes a sea witch. She puts a spell on Sebastian that makes him big, but the bigger Sebastian gets the less room their is for everyone in the sea.