Sparky, as seen in Lilo & Stitch
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Sparky's first appearance was in the film's sequel Stitch! The Movie and the proceeding television series. In Stitch! The Movie, he is the first of the original experiments to be activated (Before activation, all experiments are in pod form, excluding Stitch). He is activated by Lilo and Stitch so that they can help save Jumba, who has been kidnapped by Gantu. However, after being activated, he escapes from Lilo's home, and goes on a rampage throughout the town, shorting out any electrical appliances in sight. Soon, Lilo and Stitch manage to catch him, and convince him to be good. He helps out in saving Jumba, by shorting out Gantu's ship. Lilo decides that Experiment 221's one true place is at an abandoned lighthouse, where he can make the giant beacon light work again, and as it's big enough, he will not short it out when he touches it.
Just like Stitch, Lilo gives Experiment 221 a name of his own, Sparky. Later, he is captured and turned to evil by Angel, but she later reverses it and Sparky helps Stitch again. He also helps Lilo and Stitch rescue Angel, Slimy, Felix, Fibber, Fudgy, Plasmoid, Hammerface, Hunkahunka, Threasher, Heat, Zap, Tickle Tummy, Poxy, Nosy, and Tank with Clyde, Sample, Bonnie and Finder. In Leroy & Stitch, Sparky is kidnapped by Leroy, but is later freed and helps Stitch defeated Leroy. In Wrath of the Prehistoric Monsters, he and a few other experiments help Stitch and Lilo defeat the evil Dr. Becombo. Since he, Amnesio, Hunkahunka and Slugger can fly, they were used as surveyors to find out where Becombo would strike next.
In "Stitch and Experiment" Sparky is Stitch's closest friend and often is like a brother since he's the first experiment Lilo and Stitch captured and rehabilitated. He is voiced by Billy West.