A genius scientist named Dr. Jumba Jookiba (David Ogden Stiers) is imprisoned for illegally experimenting and creating bad robot. He creates Number 626 (Chris Sanders). He is very cute, little, blue robot with four arms, tow legs and antennae. He has strong power.
Captain Gantu (Kevin Michael Richardson), a shark like alien, is assigned to take 626 to a penal colony, but during the trip to there, 626 escapes from spacecraft, and crash lands on the small island. It is
One day, Lilo who is a little girl and her older sister Nani goes to health center to buy dog as a Lilo’s friend. Lilo is a vigorous girl so she doesn’t have friends and their parents had an accident so she lost affection. Lilo is lonely and a bit of an outcast. Nani decided to give her new friend. Lilo likes 626 when she sees 626. She names “Stitch”. Stitch initially attempts to escape from the island but he finds it is impossible because his weak point is water so he can’t swim.
Stitch always destroy something and eat foods. Lilo and Nani cannot control Stitch. One day, Social worker Cobra Bubbles (Ving Rhames) visits Nani and Lilo to improve their living conditions and he will take Lilo to foster center. Nani loses her job because of Stitch. She tries to find her new job with Lilo and Stitch to live with Lilo but is unable to secure a position as Lilo's attempts to tame Stitch by having him behave as Elvis Presley generally lead to disaster.
After one such tiring day, David offers Nani and Lilo a day of surfing at the beach. While the three of them are trying to help Stitch learn how to surf, Jumba and Pleakley attempt to capture Stitch from underwater, leading to Stitch grabbing onto Lilo and dragging her under. David manages to rescue both Lilo and Stitch, but Nani believes that Stitch was attacking Lilo.
However, Cobra Bubbles saw the entire event take place. He tells Nani that it's time to separate from Lilo from her and will be back in the morning to pick Lilo up. Stitch realizes that it was his fault and returns to Lilo's house alone. After seeing Lilo and Nani show their feelings for being together as a family, he decides to leave and hide in the woods feeling lost.
Jumba and Pleakley are fired for not capturing Stitch. The Grand Councilwoman assigns Captain Gantu to capture Stitch. This leads Jumba, no longer bound by Galactic Code, to aggressively chase Stitch in one last effort. He finds Stitch in the woods and finds out that Stitch is waiting for family to arrive. Jumba says that Stitch doesn't have his family. Before Jumba can catch him, Stitch runs from Jumba.
Meanwhile, Lilo is quiet and Nani asks what's wrong. She says that Stitch left. David then confronts Nani and tells her he as fond a job for her. Nani tells Lilo to stay at home and not to answer the door. Stitch comes back and meets Lilo in her home which also leads Jumba to it. Jumba and Stitch begin to fight inside Lilo's house, while Lilo calls Cobra Bubbles calls for help. Lilo gets out of the house just in time before Jumba and Stitch cause plasma cannon explosion that destroys Lilo's home. Nani returns home just after this occurs; unfortunately Cobra is already there and is taking Lilo away. Seeing Nani and Cobra arguing, Lilo runs off into the woods and encounters Stitch. He reveals his true alien form which makes Lilo angry. But before Lilo can say any more, Gantu captures both of them. Stitch manages to escape but is then confronted by Nani. At this point, Stitch finally speaks to her in English and shows that he is an alien and that he does understand the meaning of ohana, which means "family”, he is taught by Lilo. Jumba is able to capture Stitch in this moment of understanding, but Nani pleads Jumba to let Stitch free and to help save Lilo from Gantu, and he reluctantly does so.
Employing Jumba's spaceship, they and Gantu give chase around the Hawaiian mountains. Stitch manages to land on Gantu's ship and attempts to free Lilo but Gantu reconfigures the angle of the afterburners to blast Stitch off the ship. In a momentary state of unconsciousness, Stitch wakes up just in time to save a frog from being run over by a gasoline truck. Hijacking the same truck, Stitch drives it straight into an active volcano. Stitch taunts Gantu and releases the fuel into the lava. The explosion launches Stitch straight into Gantu's cockpit. Gantu tries to smash Stitch but ends up getting thrown off the ship. Stitch rescues Lilo just in time before the ship explodes. When everyone lands in the ocean, David is coincidentally surfing nearby and he helps transport everyone back to shore.
Immediately, The Grand Councilwoman arrives to arrest Stitch, but becomes reluctant to do so when she sees that he has reformed into a civilized creature. Prodded by Cobra Bubbles (who is revealed to be a former CIA agent who had previously met the Grand Councilwoman at Roswell, NM), Lilo presents her certificate of adoption which makes her Stitch's legal owner, causing the Grand Councilwoman to release the little creature. Stitch's sentence to life in exile provides a loophole; he is now in Lilo and Nani's care as his warders. The movie ends with both Jumba and Pleakley staying on earth to help rebuild Nani, Lilo, and Stitch's home with some of their own alien technology, and with Stitch being fully accepted into Lilo's family. They live together happily.
