The plot of the animated series is about the story of a joyful restless alien named Stitch. He is the result of a unique experiment in which genes of the most powerful and dangerous creatures of the galaxy were used. Fortunately, Stitch is able to direct destructive energy to a peaceful course. Once getting to one of the Japanese islands, he meets Yong, a schoolgirl who is as restless, as himself. Friendship with the girl helps Stitch overcome bad habits and make a lot of good deeds. Now, working together, the inseparable couple is not only able to clean up on the island, but also to save the planet from alien invasion.