Lilo & Stitch

On the planet Turo, the United Galactic Federation convicts Dr. Jumba Jookiba of illegal genetic experimentation; he has created Experiment 626, an aggressive, near-indestructible creature with advanced learning capabilities. Captain Gantu is tasked with escorting 626 into exile, but 626 escapes and hijacks a space cruiser that crash-lands on Kauaʻi, Hawaii, on Earth. Shortly after landing, 626 is run over by three passing trucks and taken to an animal shelter. The Federation's Grand Councilwoman offers Jumba early release if he retrieves 626, assisted by Agent Pleakley, the council's Earth expert.
On Kauaʻi, orphaned teenager Nani Pelekai struggles to care for her lonely and rambunctious younger sister, Lilo, after their parents died in a car crash. Social worker Cobra Bubbles doubts Nani's ability to serve as Lilo's guardian and threatens to place Lilo in foster care if their situation does not improve within three days. After overhearing Lilo wish for a friend, Nani takes her to the animal shelter to adopt a dog. Lilo adopts 626, who is impersonating a dog, and names him "Stitch". Jumba and Pleakley, disguised as tourists, attempt to capture Stitch. When Stitch attacks Pleakley at the Lūʻau where Nani works, Nani is blamed and fired. Bubbles orders Nani to find a new job and instructs Lilo to teach Stitch to be a "model citizen".
Despite Lilo's efforts to domesticate Stitch, his destructive behavior repeatedly sabotages Nani's attempts to secure employment. While Nani, Lilo, and Stitch go surfing with Nani's friend and former co-worker David Kawena, Jumba and Pleakley make another attempt to capture Stitch. During the chaos, Stitch unintentionally pulls Lilo underwater; Nani rescues Lilo, and David rescues Stitch. After witnessing the incident, Bubbles informs Nani that he will return the next morning to take Lilo. Feeling guilty for causing trouble, Stitch runs away. Having failed their mission, Jumba and Pleakley are dismissed by the Grand Councilwoman, who assigns Gantu to capture Stitch. Now unrestrained, Jumba pursues Stitch using more aggressive tactics. When David tells Nani about another job opportunity, she leaves Lilo at home alone. Jumba and Pleakley chase Stitch back to the Pelekai home, and their fight results in an explosion that destroys the house.
Nani secures the job but rushes home after seeing a fire engine heading toward her house, and Bubbles arrives to take Lilo. As he and Nani argue, Lilo runs into the woods and encounters Stitch, who reveals his alien identity moments before Gantu captures them both. Stitch escapes just as Gantu's ship departs with Lilo. Nani confronts Stitch, but Jumba and Pleakley capture him as well. When Nani pleads with them to rescue Lilo, they refuse, stating they are only authorized to capture Stitch. As Nani breaks down, Stitch recalls ʻohana, the concept of family that Lilo taught him, and convinces Jumba to help. Jumba, Pleakley, Stitch, and Nani board Jumba's spaceship, pursue Gantu, and rescue Lilo.
The Grand Councilwoman arrives to retrieve Stitch and dismisses Gantu for endangering Lilo and failing his mission. After witnessing Stitch's changed behavior and learning that Lilo legally adopted him from the animal shelter, she allows Stitch to remain on Earth to serve his exile. She also places the Pelekai family under the protection of the United Galactic Federation. Bubbles reveals that he is a former CIA agent who previously encountered the Grand Councilwoman in Roswell, New Mexico, in 1973. Stitch, Jumba, and Pleakley become part of Lilo and Nani's family, and together with David and Bubbles, they rebuild the house.