Experiment 234, designed to collect private enemy conversations through her tail, is accidentally activated by Lilo. When she gets into trouble after overhearing part of a conversion and thinking that Mertle hates her friends, Mertle, out of anger, willingly helps catch experiments for Hamsterviel.

Lilo & Stitch learn that Mrs. Hasagawa has adopted a lot of cats that are not cats at all but experiments.

Experiment 062: FRENCHFRY When Nani restricts Lilo's food to healthy food, Lilo finds an experiment pod that is designed to make tasty, irresistible food, but he is secretly fattening them up to eat them. Will they be saved in time?

Experiment 319: SPIKE Lilo and co. set out to beat Myrtle and her family in the Ohana-Rama.

Experiment 355: SWAPPER When Swapper swaps Lilo and Stitch's brains, Lilo thinks it will be impossible to get Victoria, a new girl, to think that she's not weird.

When Dr. Drakken and Hämsterviel team up to kidnap Stitch in order to mass multiply him in order to destroy the world, Kim Possible and Lilo set off to try and save Experiment 626. Jumba, on the other hand, is quite sure that a certain Naked Mole Rat is his experiment 607...

Nosy, (who escaped at from Gantu's ship at the end of Woops,) complains to Lilo about the fact that she just left all the experiments behind and never found their one true place. (Lilo and Stitch never went back and saved them). So, Lilo plans to save them, especially Angel. But when Snafu, a plan ruiner is on the loose, will Lilo be able to save Stitch's cousins?

Experiment 113: SHOE When bills go high Lilo tries to earn money by Mertle's idea: A bed and breakfast. However, experiment 113 is activated and is causing bad luck at Jumba and Pleakley's Bed and not Breakfeast.

Experiment 089: SKIP Lilo's desire to hurry and grow up is immediately satisfied when Skip, experiment 089, arrives and ages her up to a 17-year-old and then a 27-year-old. Lilo soon realizes she wants to be age 7 again because she misses out and ruins the future. She must figure out how to "reset" herself.

Experiment 267: WISHY-WASHY Lilo learns a valuable lesson in being careful what you wish for when Experiment 267 is activated.

Experiment #276: Remmy | On the anniversary of the day when Lilo's ohana became broken, Lilo desides to take a nap, the day only gets worse when a nightmare causing experiment enters her dreams.

Experiment 029: CHECKERS Lilo is angry and under appreciated about her float not getting chosen for the parade, and being grounded (along with Stitch) by Nani and Pleakley.

Experiment 277: SNOOTY After making zombie calenders, Lilo, Stitch, and Victoria encounter experiment 277, a vampire bat like experiment who was made to find and enrich Snootonium, a dangerous chemical that is similar to mucus. Can Lilo and Stitch safely catch Snooty bafore Victoria, who is distrustful and teams up with Gantu to slay him?

Spats (Crossover with The Proud Family) The Prouds pack their bags for a Hawaiian vacation on. Lilo prepares for the grand re-opening of Jumba & Pleakley's Bed Not Breakfast and eagerly awaits the arrival of their scheduled guests - Mr. Cooper, a reviewer for Relaxing Times Magazine, and the Proud Family who are attending Wizard Kelly's Smack-up Throw-down Hi-wyan Style Y'all. While trying to impress Mr. Cooper, arguments ensue when Suga Mama accidentally activates Experiment 397, "Spats" causing friction among all. It's up to Penny and Lilo to find the cure.

Experiment #262: Ace | When Jumba is in danger of losing his membership to E.G.O. (Evil Genius Organization) he has to show the leader that his experiments are still evil. But when Experiment 262 is activated and according to the experiment computer it has no evil function, things get worse.

Experiment 223: Glitch | Jumba automates the house, but an experiment gets into the computer and the house goes crazy! Can Lilo and Stitch save the day?

Experiment 251: LINK After being inadvertently activated, Experiment 251(later called Link),starts joining people together with a sticky rope. He joins, among others, Lilo and Mertle, Jumba and Pleakley, and Nani and Stitch. Will Lilo be able to capture the experiment? Will teamwork save the day? Note: This episode is the bonus episode on the Leroy and Stitch DVD.

Experiment 133: PJ Lilo's always getting blamed for Mertle's pranks, so she figures it's high-time to pull a few pranks of her own, and what better prank-ee than the mean old substitute hula teacher?

Experiment 322: HECKLER Experiment 322 is activated just in time to taunt Pleakley as he makes his stand-up comedy debut at Nani's charity event. While Lilo is first amused by his off-the-cuff jabs, especially towards Mertle, she soon learns that mean words only hurt if you let them.

Experiment 128: BUGBY Lilo, Stitch, Jumba, and Pleakley are turned into bugs after Lilo captures an experiment for her bug collection.

Experiment #600: Woops | Gantu sends Hamsterveil an unactivated pod whilst Pleakley enters a domino competition. Will Woops get in the way?

Experiment 020: SLICK Chaos ensues as Slick, a fast-talking experiment who can sell anything to anyone, teams up with Lilo and Stitch to sell candy bars for the Hale Kaiulu's annual fundraiser. Lilo soon learns the hard way that Slick is not designed to stop, and she and Stitch must reclaim their household items before it gets too late.

Experiment 505: PLOOT When Lilo sets out to clean the pollutants from the Grotto where Pudge the fish lives, she comes across Ploot, a.k.a Experiment 505, eating all the litter around him.

Experiment 210: RETRO Nani meets some of her friends from high school and tries to impress them by saying she is vice president and they convince her to introduce them to her family. The day only gets worse when experiment 210, tries to revert everyone back to a prehistoric state...

Exxperiment 316: MORPHOLOMEW (Crossover with American Dragon: Jake Long) Lilo enters the island's skateboarding competition in an attempt to win the heart of her one and only crush, Keoni. At the same time, Jake, Gramps and Fu Dog visit the island to check out reports that magical creatures - actually Jumba's experiments -- are running rampant.