Ariel composes a celebratory song for Atlantica, but her overzealous efforts to assist Flounder in the All-Atlantica Swim Race teach her the value of letting friends progress at their own pace.
When Lucia wants to earn a badge at Ursula's Magic Camp, Ariel and Ursula help her learn that keeping things small and simple is the best way to reach her goal; Fernie worries he won't do a good job in the Open Market Show and Tell after he loses his trusty fish facts notebook.
Ariel tries to stop a pesky hermit crab from stealing her land treasures; when Ariel is tasked with being the royal banner carrier for Atlantica's parade, she thinks it's a small job and doesn't take it seriously.
When Ariel doesn't want to sleep at a sleepover, she asks her Tantie Ursula to use magic to stop time so that bedtime never comes; Ariel learns the importance of family time when she misses a special dinner with King Triton.
Ariel grows frustrated when her little cousin Jewels visits and won't stop copying her; when King Triton declares Happy Crabby Day as a day off for all crabs, Sebastian must try to relax.
Ariel and her friends volunteer to run Ravi's Juice Stand while he's away, but their lack of communication stirs up a big mess; Ariel tries to help Ayanna with a hair emergency on their family picture day.
Ariel volunteers to watch cuttlebaby eggs to prove that she's a good babysitter; Flounder is chosen as the team coach for the Royal Family Cricket Game.
Ariel and her friends can't find a role for Delfino the dolphin in their band; when Ayanna is unable to compete in the Clap Game competition, Ariel steps in so that Alanna can still participate.
Ariel helps Ravi and his best friend Navi clear up a misunderstanding; Flounder uses his cooking skills to help other chefs at the Atlantica Food Festival.
Ariel befriends a little Goby fish who wants to go on adventures like her; Triton accidentally drinks Lucia's magical potion, which turns him into a kid.
Antie Chantale, a marine biologist, comes to visit, and Ariel feels left out when she bonds with Fernie over fish facts; Ariel invites a lost remora named Remy to stay at her Crystal Cavern.
When Fernie doesn't believe in the Kite Monster legend like his friends do, he starts to ruin their fun; Flounder uses Ursula's magic mirror to play a trick on his friends.
When Fernie forgets his comfort blanket at home, he puts on a brave face in front of his friends by saying he doesn't need it to fall asleep; Lucia makes two other versions of herself so she can be at three different playdates at once.
When Flounder forgets to send his Christmas letter to Santa Mer-Claus, Ariel and her friends go on a holiday adventure to deliver the letter to him; Sebastian accidentally donates the box of toys that Ariel wants to keep.
