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.
Despite King Triton's warning, Ariel uses magic to clean her room; Ariel and her friends befriend a shy clam.
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.
Ariel tracks down a mythological sea creature; Ariel and friends get a substitute teacher in music class.
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.
Ariel explores the Crystal World to find out where her axolotl buddy wandered off to. When Lucia performs the Octo-Juggle magic trick, she finds out that it's harder than expected!