Stitch & Ai - Season 1

Stitch is held captive on a spaceship above Earth by an alien faction called the Jaboodies, who want to use him against his own will to win a space war against their enemies, the Woolagongs. However, the Woolagongs themselves attack the ship wanting Stitch for themselves, accidentally freeing him in the process during the fight and allowing him to escape back to Earth. Upon re-entering Earth's atmosphere, Stitch lands in China's Huangshan mountains where he meets orphaned Chinese girl Wang Ai Ling. Her aunt Daiyu has told her that she will be forcibly moved out of her mountain home and separated from her older sister Jiejie to live in a city. The two quickly bond as the girl shows the blue alien around the mountains. Stitch desires to find a shrine he's been seeing in visions he had, but once Ai takes him to a shrine that does not match the one in his visions, they soon find themselves pursued by both alien factions. Ultimately, Stitch and Ai lead them on a goose chase around the mountains, causing a number of both factions' soldiers to be knocked out and forcing them to teleport away to regroup. When Stitch and Ai finally arrive at the latter's house, Daiyu sees the unusual and "ugly" Stitch and freaks out, calling for Jiejie, but when she turns her back, Stitch curls into a ball and Ai pretends to be playing with the blue "ball". After Jiejie brings Daiyu back inside, Stitch then tells Ai that the two of them will find a way to get her to stay in the mountains where she belongs.

Ai, who's happy to now have Stitch in her life, is ready to show her science class a strobe light she made. However, she and Stitch, who snuck into her school, find that her teacher has been possessed and mutated by a Woolagong sent to capture Stitch, leading to Stitch and Ai fighting the possessed teacher in the classroom. Meanwhile, at Mr. Ding's tea shop, Jiejie tries to convince Daiyu to not move Ai to the city, deciding to bring her to Ai's school to show that Ai is getting a good education there.

After Jiejie and Dahu head out, Stitch and Ai find they are being spied on by the Jaboodies' "spybots". Meanwhile, Jumba and Pleakley are ordered by the Grand Councilwoman—who knows about the "metamorphosis program" Jumba programmed in Stitch—to go to Earth and bring Stitch back before either the Jaboodies or the Woolagongs get him first. Once they arrive, however, they find that Stitch isn't willing to be taken away by anyone, even his old family.

Jumba and Pleakley come to Earth to get Stitch, who flees with Ai to an old shrine with a strange sage there. The sage helps Stitch and Ai flee from the aliens and sidetracks Jumba with ancient scrolls that detail monsters, which peaks the scientist's "mad genius" curiosity, leading him to create a qilin. Shortly after Stitch and Ai return home, the Jaboodies' drones arrive to capture Stitch, but he's saved by Jumba's qilin, who destroys the drones. However, Jumba then finally captures Stitch afterward, which upsets Ai to the point of having a breakdown. After Jiejie passionately argues for Jumba and Pleakley to let Ai keep Stitch, the alien partners free him and explain to the Grand Councilwoman via video chat what happened. She permits Jumba and Pleakley to let Stitch live with Ai, under the condition that they are responsible for safeguarding him.

Jumba creates a dragon, which disobeys him. He then realizes the dragon needs a mate or it will turn bad for 100 years. He succeeds in making a mate for the dragon, who then produce an egg. After Stitch, Ai, Jumba, and Pleakley spend the night with the dragons, Stitch finds himself targeted by the Woolagongs, who inadvertently threaten the dragon egg. Stitch, Ai, and the dragons fight the Woolagongs to protect the egg before it hatches.

Ai explains in the cold open that Stitch was protected by "special qi energy" during his re-entry into Earth's atmosphere in the first episode; the same energy was also responsible for him losing much of his memories of his life before Ai, including Lilo. He knew that he had to find a secret shrine but does not know where it was or why he had to find it. In the episode proper, Ai takes Stitch to a bridge where several locks are. Friends write their names on the locks and lock them on the bridge as a symbol of their unbreakable friendship. Unfortunately, Stitch does not agree with where to place the lock, resulting in them fighting over it and dropping the lock below the bridge. They then get attacked by both Woolagongs and Jaboodies going after Stitch once again, and Pleakley ends up getting caught up in the fight when he tries to rescue the duo. Jumba sends out his latest experiment, a xiezhi, to save Stitch, Ai, and Pleakley. After the two alien factions are defeated again, Stitch finds the lock, and he and Ai finally agree on a spot to lock it.

Dahu is assigned to lead the town's annual Chinese New Year dragon parade. A dragon puppet for the parade is ruined by accident when Meiying and her friends accidentally burn it while taking smartphone photos, so Ai has Jumba substitute the puppet by having Dim Long temporarily enlarged to take its place. Meanwhile, Stitch tricks the Jaboodies and the Woolagongs to invade Earth at the same time to get him, causing them to fight and severely damage each other at the end.

Ai and her classmates are motivated to produce and share videos for an online event called Tell the World. Meanwhile, Jumba creates a nian who captures children around town. When Stitch and Ai find out that the nian likes watching videos, they pretend to be a director and producer who are going to make him a movie star so they could trick him into leading them to where he captured the children.

Daiyu brings Ai's cousin Bao to try to convince Ai to move to the city. Jumba creates a fenghuang that quickly grows and flies off to find a ruined shrine, so Ai, Stitch, and Bao head after it. However, two alien bounty hunters named Noo-bing and Zi try to capture the fenghuang to try to sell it to collectors. (Note: This episode was not released in the United States.)

The Woolagongs send an agent down to knock out and capture Stitch. His dream beam gun instead zaps Ai, bringing her imaginary friend, Cheng Fei, to life. Cheng Fei takes her to a mythical land in the mountains called the Valley of Dreams, which brings Ai's dreams, good and bad, to life, including a dream of Stitch growing into a monster. Meanwhile, Jumba creates a mo, and Stitch captures the agent that zapped Ai. After Jeijei contacts Jumba saying that Ai was absent from school, the aliens set out to find the little girl.

Stitch decides to be naughty and mass-produce mythical creatures Jumba has been working on. The end result is ruining the nuo opera the town was planning to put on. Cobra Bubbles radios the Galactic Alliance, ready to apprehend Stitch. However, after witnessing Stitch remedy his mistake and gets the creatures to behave and successfully help put on the nuo opera, he calls off the attack.

The episode was listed as "Creatures" on DisneyNow when the series was available in the United States.

In this first half of the two-part series finale, Pleakley receives a strange alien device with various functions called a "Tetra-Tab". Ai and Stitch use the device to give themselves "brothers" named "Yong" and "Scratch". They all get along until Scratch starts convincing Stitch to destroy things, getting him to destroy a model city and then a construction site, with Ai, Jumba, and Pleakley finding out about the latter on the local news. After Stitch destroys the construction site, Scratch leads him to a city under construction and convinces him to start destroying it, finally getting Stitch to activate his metamorphosis program and grow into a giant monstrosity. Ai and Yong arrive on Jumba's hovercraft to see the giant Stitch beginning to approach the city.

Ai learns that Yong and Scratch are actually disguised Jaboodies that have activated the metamorphosis program in him. The now-giant Stitch attacks the city, unwittingly on behalf of the Jaboodies, growing bigger and more powerful the more he destroys. The Jaboodies, including their leader Commander Wombat, then reveal themselves to him and capture Ai. Despite Wombat and Scratch's attempts to convince Stitch serve the Jaboodies to win their space war against the Woolagongs, Ai is able to get through to the real, good-hearted Stitch. Stitch turns on the Jaboodies and uses his new form to destroy their weaponry and rescue Ai, and then he shrinks back down to his normal size and form. Jumba and Pleakley arrive to help, with the former summoning his recreated Chinese creatures from his pocket dimension, and the heroes drive the Jaboodies away. After returning home, Stitch is disappointed to still not have found the shrine from his visions but is nonetheless grateful to have a family.