Sparky (Lilo & Stitch)

Experiment 221, better known as Sparky, is a genetically created alien experiment. He resembles a small, light-yellow Chinese dragon/Monkey/Gecko-like creature with a small body, skinny arms, stubby legs, twisted tail, an oval-shaped head, a pair of dark blue eyes, two triangular ears, and a pair of long slender antennae. His body can turn into a lightning bolt, allowing him to easily fly or travel through outlets, power lines, and machines. He was the first experiment that Lilo and Stitch turned from bad to good and first appeared in Stitch! The Movie. His one true place is powering the old lighthouse that had been abandoned for requiring too much electricity, though he offers aid to his friends. He is voiced by Frank Welker in the series.

Personality
Like Stitch, his cousin, Sparky is shown to be highly mischievous. He also shares Stitch's habit of picking his nose with his tongue. Sparky was once a very bad and mischievous creature—as he was programmed into his very being by the alien mad scientist Jumba Jookiba. His original purpose was to cause huge electrical surges which would disorientate those that were caught in it, but he changed when he was caught and reformed shortly after his activation.

After his short reformation, Sparky was turned good. Overall, he's friendly, though he's quite cautious in new places. He also still holds a mischievous side to him, and although he's a good genetic experiment, he sometimes can't help messing with electronics and machines.

Sparky holds his ohana—a word that another experiment, Stitch, and a little girl called Lilo had taught him—very close. "Ohana," being the Hawaiian word for "family." He'll help his family and friends whenever they need a hand, and though he might get into an argument with them occasionally, he's not one to turn down a cry of help.

Stitch! The Movie
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. However, he 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 sized light work again, and as it's big enough, he will not short it out when he touches it.

Lilo and Stitch: The Series
After the film, Sparky became a supporting character in the series. Lilo and Stitch often visited him along with other experiments for various problems.

In "The Asteroid," Sparky was one of the six experiments who Stitch convinced to come with him and Lilo to save Earth from an approaching asteroid. Sparky was shown to use his electrical powers to jump-start the ship and, during the journey, prank Hammerface and electrocute Pleakley when the latter touched him.

In "Angel," Sparky was one of the experiments who Angel reverted to evil using her song. Sparky and the other dehabilitated experiments attacked Stitch aboard a ship, but Angel turned them back to good before they could finish Stitch off. Working together, the experiments were then able to successfully escape the ship.

In "Skip," Sparky was one of the wanted fugitives in an alternate future where Hämsterviel ruled Earth.

Sparky was one of the experiments in "Checkers" who joined Stitch in a rebellion against Gantu.

In "Ploot," Lilo tried to convince Sparky to help her defeat Ploot, but Sparky refused.

Sparky was one of the experiments in Lilo's dream in "Remmy."

In "Snafu," Sparky was one of the experiments who joined Lilo and Stitch on a mission to rescue Gantu's captive experiments (in actuality, Lilo drew him away from the lighthouse with a trail of batteries). Sparky helped break into the ship, and after the team successfully freed the captive experiments, Sparky was seen playing with them in Lilo's obstacle course.

Leroy and Stitch
In the film. Sparky can be seen waving hello to Stitch and Lilo. Later on, Sparky is captured by Leroy and taken captive to an arena where he and the other experiments are nearly obliterated until Stitch storms in. A war follows between the experiments and the Leroy clones. Sparky uses his incredible shock waves to defeat the villains. In the end the clones are destroyed and Sparky resumes his job at the lighthouse.

Stitch!
The episode An Electrifying Experience introduced Sparky to the anime series. Here, Sparky is kidnapped by Hämsterviel and put under mind control in an attempt to steal Stitch's Good Deed Counter. Sparky is sent to Izayoi Island where he causes chaos having Stitch and Yuna search the town to investigate. They hear stories of a yellow ghost about and they finally catch up with him. Stitch was excited to see his cousin but this changed after Sparky electrocuted Stitch and ran off. Later on, Jumba realizes the head cap on Sparky's head, recognizing it as a mind control device. Suddenly, Gantu and Sparky arrive at Yuna's house but after a confrontation with Yuna's grandmother, Sparky runs away. In the woods, Sparky takes Stitch's counter but lightning courtesy of the Spiritual Stone, causes Sparky's head cap to come apart. Sparky and Stitch let bygones be bygones and reunite. Sparky would later have a recurring role as one of Stitch's closest friends.

Kingdom Hearts Birth by Sleep
When Terra and Jumba reached the room that Experiment 626 was being contained in, Jumba tells him that he had created him for the purpose of evil, and that he was designed to wreak havoc and destroy everything that he touches just as he releases Experiment 626. Experiment 626 then lunges at Terra and steals his Wayfinder. Terra cries out that a friend gave him that and begins to realize just how much he misses them. Experiment 626 drops the Wayfinder and leaves the room which makes Terra question Jumba if his experiment is really all that evil.

Angered by the question, Jumba assures him that he is and asks "Or do you need another demonstration of my evil geniusness?!" He then pulls out a small green ball and a test-tube filled with water and laughs hysterically as he places it in the water. Experiment 221 emerges and attacks Terra. When Terra defeats Experiment 221, it reverts back to its pod form. Jumba then reassures it that everything will be all right just as Experiment 626 reenters the room.

Disney Parks
Sparky can rarely be seen at the Disney Parks except for in Disneyland Paris and Tokyo Disneyland where he make regular appearances being that his franchise is extremely popular in Japan.

Stitch's Hawaiian Paradise Party
Sparky can be seen here located in Disney Village at Disneyland Paris where he and other experiments show up for meet and greets.

Lilo and Stitch's Big Panic
Sparky appeared in the special event at Tokyo Disneyland. He is seen in the parade alongside other experiments including Reuben and Felix.