Penny challenges Yuna and her karate class to a dojo match and Stitch decides to join in. He loses Yuna's sand necklace and thinks she can do the dojo without it.

Hämsterviel gets Jumba to absorb power from the Spiritual Stone so he can gain ultimate power, while Yuna plans to break a shrunken-down Stitch out of the American football-shaped container Hämsterviel put him in.

Stitch is captured and now the whole island must rescue him. His friends, Jumba, Angel, Sparky and Felix are brainwashed by Hämsterviel and Gantu, too.

Yuna and Stitch discover that there's a treasure buried in the forest of Shadow Valley. Angel appears and decides to go with them. But when Gramma tells them the horrible legend of the yōkai Pilolo who lives in the forest, they decide not to go. But the treasure dwells on Angel's mind and she sets out to find it on her own. With the help of Kijimunaa, Yuna and Stitch set out to find her. They find her fallen into a deep coma, and they must now find out why.

Yuna, Stitch, Jumba, and Pleakley help Kijimunaa go to the Twin Caverns so he can become a guardian and help Gramma get better.

Everyone is planning a surprise party for Yuna, and Stitch promises not to lie to her after he lies for eating her corn and Yuna thinks no one cares about her.

Jumba gets Stitch to be his new lab assistant, but when Stitch doesn't help properly, he quits and runs into town. Jumba notices some mysterious things going on in town and meets a yokai named Topsy-Turvy who turns things around.

While Mr. Honda the postman is sick, Yuna and Stitch deliver a dropped letter to a woman named Mrs. Tanaka. Meanwhile, Jumba and Pleakley find a letter for Yuna.

Yuna, Taro and Stitch enter a singing competition, but Stitch realizes he can't sing. Taro really wants to win so he can get a trip to the hot springs for his dad, so Pleakley gives him lessons.

Penny shows off a book of her idol, Tetsuo. So Yuna and Stitch pull Penny's book and Stitch tears it up in half. Meanwhile, in Yuna's dojo, directors and producers come and pick Stitch to become an actor.

When JJ, a student at Yuna's dojo, wishes his father wasn't so strict, a yōkai named Himamushi makes it come true. Yuna and Stitch try to convince Himamushi to change him back to normal.

Yuna and Stitch meet a Feebema named Damacchi who doesn't fit in with other Damacchis. They soon realize the reason he doesn't belong is because he's a meteor shower.

Yuna's student Taro doesn't like eating healthy food to win the black belt competition. When Reuben comes, he makes rice balls with secret food in it so Taro can win.

Christmas is coming to the island. Hämsterviel has a plan to hypnotize all the kids of the island to do his bidding by eating bad cookies. Jumba comes up with a plan to reverse the attack. After Yuna and Stitch stop him, they don't think there's gonna be a Christmas. When Santa comes, he gets Stitch to help him send the presents around the island.

Yuna gets sick on the day of a festival and Stitch goes with Angel instead. Stitch meets a yōkai named Dolores (Foxy Beige in the English dub), who promises to make fireworks for Yuna in exchange for her own things.

Yuna has a class visit to the local pineapple factory. She arrives late because Jumba invented a good deed tracker to let Yuna type her diaries. Stitch is more interested in eating the pineapples. Two yokai who look like pineapples then attack the pineapple factory, peeling the unprocessed pineapples and eating their flesh. Jumba invents a gun to stun and capture the yokai.

A yōkai named Warracchi starts playing harmless and amusing pranks on the island's inhabitants. Seeing how these pranks seem to make everyone happy, Stitch soon begins playing pranks of his own, but they quickly get out of hand.

Stitch is scolded by Yuna for making a mess. Rather than clear it up himself, he borrows a transmitter and calls in Felix to help. Felix cleans up messes all around the island's town, but he starts cleaning away antiques when he runs out of trash and messes to clean.

Yuna borrows a camera from Jumba to take a picture for a competition. It's actually a device that reproduces what it photographs and soon there are lots of Stitches around.

Stitch accidentally hatches a baby bird and the chick thinks that he is its mother.

While Yuna tries to decide what to give Grandma for her birthday, Stitch gets a visit from an old friend, Angel, whom he really likes.

Hamsterviel wants Stitch's good deed counter, so sets a modified Experiment 221 onto him; before the Spiritual Stone helps him get back to normal, 221 gives people shocks.

Stitch discovers a magic paintbrush and he & Yuna need to learn to get along and not be so angry.

Yuna catches some fish and Grandma suggests she give some to Yokai Kijimunaa. They head to the forest to find him and discover he's lost his tree, having been cheated in a sumo match.

Stitch hears a legend which will grant him any wish he chooses if he does 45 good deeds. However, it's not as easy as it sounds. Jumba and Pleakley arrive on Earth and find Stitch.

While messing around on a new space scooter, Stitch and Jumba get sucked into a black hole; Stitch lands on a Japanese island and makes friends with local girl, Yuna.