Stitch

Stitch, also known as Experiment 626, was created by the evil genius Dr. Jumba Jookiba as part of illegal genetic experiments. He's designed to be incredibly strong, virtually indestructible, and intelligent, with a primary function to cause chaos. 626 escaped his confinement and crash-landed on Earth in Hawaii. He disguised himself as a dog and was adopted by Lilo, who named him Stitch.