The genetic experiments created by Dr. Jumba Jookiba are a large group of genetically engineered alien lifeforms in Disney's Lilo & Stitch franchise. Dr. Jumba created them in his laboratory at "Galaxy Defense Industries", most of them with the shady financing of his former lab partner Dr. Jacques von Hämsterviel. Many of the creatures were designed for evil, mischievous, and destructive purposes, though how "evil" they act tend to vary. There are at least 629 experiments, the most famous of which is Experiment 626, better known as Stitch, who is the franchise's primary protagonist.
The experiments other than Stitch first appeared in prequel spin-off material that was released before the 2002 original film, including the PlayStation 2 game Disney's Stitch: Experiment 626. Although at least one of them have technically appeared in every Lilo & Stitch work—thanks to Stitch—they were not a major focus of the franchise until Stitch! The Movie, the 2003 direct-to-video pilot to Lilo & Stitch: The Series. Additionally, the 2017 Chinese animated television spin-off Stitch & Ai excludes all of the original experiments apart from Stitch and instead introduces brand new ones based on Chinese mythological creatures.
In the first television series, Stitch and his best friend Lilo Pelekai hunt down the experiments, who were scattered around Kauai as dehydrated pods thanks to the events of the pilot. The pods activate when they come into contact with water. When the duo captures and tames an experiment, Lilo gives them a name, and they find a "one true place" (i.e. occupation) where the experiment can use its abilities for productive purposes.
Stitch, inspired by Hawaiian terminology, refers to nearly all his fellow experiments as his "cousins" and sees them all as part of his 'ohana, or extended family.
List of experiments seen in games
Each experiment's number are usually pronounced as individual digits (e.g. "Six-Two-Six" instead of "Six Hundred [and] Twenty Six"), with the only known exceptions being those whose numbers are divisible by 100 (such as X-300/Spooky and X-600/Woops), whose numbers are pronounced as whole numbers, and X-619/Splodyhead, whose number was pronounced as "Six Nineteen" by Jumba. The official shorthand prefix for "Experiment" is "X-" (X with a hyphen), according to several episodes of The Series and the 2004–2018 Walt Disney World attraction Stitch's Great Escape!. All the first 626 experiments' names were fully revealed in The Series's finale film, Leroy & Stitch.
Since it would take a long while to list all of the experiments here, especially since the large majority of them remain unseen in the franchise to this day, only the experiments who appear in video games are listed here. Fandom's Lilo & Stitch Wiki features a full list of experiments on their site. Experiments listed here are organized based on their experiment numbers; they are alphabetized in the characters tab on the sidebar to the right.
- X-007/Gigi: Designed to annoy others by constantly barking. Looks like a Shih Tsu, she was adopted by Mertle Edmonds as the girl's pet "dog".
- X-010/Felix: Designed for cleaning purposes. Also known as "Oscar" when he's re-programmed to spread dirt.
- X-025/Topper: Designed to signal a planet-invading alien fleet. He was given to a young girl and is used to be the top of a Christmas tree.
- X-040/Backhoe: Designed to efficiently dig and scrape up vegetation.
- X-150/Clyde: Designed for theft and evasion purposes. He has a bionic left arm and works with Bonnie (X-149) for their purposes. Both of them were arrested and sent to prison, but were later paroled.
- X-151/Babyfier: Designed to turn people into babies. He was given to the animal shelter where Stitch was adopted, where Babyfier reverts old dogs to puppies, increasing their chances of being adopted.
- X-158/Finder: Designed to effectively find anything upon request. He operates a lost and found stand on Lahui Beach.
- X-177/Clip: Was designed to eat a fuel source, but due to a programming error, she eats hair instead. She became a hair stylist.
- X-221/Sparky: Designed to cause short circuits. He was the first experiment that Lilo and Stitch tamed, doing so in Stitch! The Movie. He operates Kilauea Light in-universe, powering the lighthouse's beacon.
- X-254/Mr. Stenchy: Designed to allure enemies with his cute charm in order to get them to take him to their headquarters, then in 42 hours he emits an odor so noxious that it would render a whole region inhospitable. He was sent to Pleakley's home planet as his species actually appreciates the smell.
- X-258/Sample: Designed to annoy others with sounds that the records and plays back repeatedly. He provides backbeats for a previously rhythmless band.
- X-297/Shortstuff: Originally designed to sabotage machinery, he was accidentally enlarged and is now an amusement park attraction.
- X-303/Amnesio: Designed to cause memory loss.
- X-323/Hunkahunka: Designed to cause people to fall in love with the first person they see.
- X-344/Dupe: Designed to clone others, causing their strength to be divided among themselves. He duplicates X-523/Slushy's shave ices to make them half-calorie.
- X-383/Swirly: Designed to hypnotize others into doing the next order or suggestion they hear. He does hypnotism at birthday parties for harmless entertainment.
- X-501/Yin: Designed to suck up and shoot water. She works with X-502/Yang to create a whole new island.
- X-502/Yang: Designed to spout lava. He works with X-501/Yin to create a whole new island.
- X-513/Richter: Designed to cause earthquakes. He works at the rental hut on Lahui Beach making milkshakes.
- X-520/Cannonball: Designed to generate giant waves and tsunamis. He generates choice surfing waves at Lahui Beach.
- X-523/Slushy: Designed to generate tons of snow and ice. He works at a shave ice shop making the frozen dessert.
- X-533/Blowhard: Designed to immobilize objects and people by blasting them with strong winds, causing his victims to fly like kites. He lives with Mrs. Hasagawa as one of her "cats".
- X-586/Tank: Designed to eat metal.
- X-601/Kixx: Designed to beat up others with his four strong arms and kickboxing skills. He hosts a series of workout videos called Kickboxing with Kixx.
- X-602/Sinker: Designed to cut vessels with his large, sharp dorsal fin. He works at a Japanese restaurant making sushi.
- X-603/Zap: Designed to be a living laser bolt.
- X-606/Holio: Designed to turn into a black hole. He works in construction sucking up debris.
- X-608/Slugger: Designed to deflect enemy projectiles with his baseball bat-shaped tail. He works as a Little League Baseball coach.
- X-613/Yaarp: Designed to emit deafening sonic blasts. He works as an alien invasion alarm at Lilo's halau hula (hula school).
- X-617/Plasmoid: Designed to fire hot plasma from his tail.
- X-619/Splodyhead: Designed to fire hot plasma from his lone nostril. He works at David's luau lighting tiki torches.
- X-621/Chopsuey: An early prototype of 626 who only appears in Disney's Stitch: Experiment 626, which was retconned by the film Lilo & Stitch 2: Stitch Has a Glitch.
- X-624/Angel: Designed to sing a siren song that reverses the morality of reformed creatures, primarily the experiments made before her. Stitch's girlfriend and the only predecessor he does not call a "cousin"; they call each other their "boojiboo", a word in their Tantalog language that essentially means "sweetheart" or simply "my love".
- X-625/Reuben: Designed for the same purposes as his immediate successor, but is too much a lazy coward to do so. He can speak English fluently and loves to make delicious sandwiches. He was first activated in Stitch! The Movie, but he was the last experiment to receive his name (in Leroy & Stitch). After that film, he works with Gantu in the Galactic Armada as a galley officer.
- X-626/Stitch: Designed to destroy large cities and "everything he touches". The franchise's "cute and fluffy" titular lead, he defied his destructive programming after meeting Lilo.
- X-627: Designed to be a much more powerful version of Stitch without any capability of reforming. He loves to laugh, but doing so hurts him. Since he cannot be reformed, he was dehydrated back into a pod and stored away by Jumba.
- X-629/Leroy: Stitch's evil twin made under the demands of Dr. Hämsterviel who was cloned shortly after creation. Until June 2020, he had no official experiment number; he was deemed to be Experiment 629 in a Disney Tsum Tsum-exclusive volume of the web manga Tono & Stitch, known in English as Stitch & the Samurai. Thanks to a fail-safe Jumba programmed in him (the song "Aloha 'Oe"), he and his clones were shut down and sent to galactic prison with Hämsterviel.