Season 3: Best Friends Forever

Stitch and Yuna move to Newtown because Obaa can no longer support Yuna as she is growing old and Stitch must find and purify any remaining altered experiments. While they are there they meet Reika, her friends, and Takumi. Later Stitch wants to return Yuna's handkerchief but ends up almost destroying the school which upsets Yuna. Hamsterviel puts in two coins in a large gum ball dispenser and gets two large experiment pods out and then runs in front of a screen that reveals Delia which is Hamsterviel's new partner. Delia calls Hamsterviel Hamu Sama which causes hamsterviel to say that his name is hamsterviel not Hamu Sama, which causes Delia to get annoyed and screams "there all the same to me!" Stitch later begins to leave and gets attacked by Plasmoid and Splodyhead and again destroys the school which then makes Yuna think Stitch has broken his promise and lied to her. Stitch stays away from Yuna to try catch the two altered experiments but gets captured by Gantu. Yuna feels sorry for Stitch and goes to find him at school but then gets attacked by Plasmoid and Splodyhead. Stitch then saves her and Yuna apologizes for not believing in Stitch. After hearing about Hamsterviel's failure Delia tortures him with a bomb.

Yuna went to school to make new friends. Can't tell how annoying Jessica is, a girl who is in deed a rival with Yuna, she tries to make friends, but couldn't. Later, Yuna was thinking if she could make some jokes, maybe she will be Jessica's friends. She need help from Peakley, who could help her. At school, they were attack by a dancing experiment. Yuna save Jessica and the school from the disaster. Trickly, in the end, they both can't be friends. Experiment appearances: Experiment 258 (Sample), Experiment 625 (Reuben)

Yuna latest attempt to befriend Jessica is trying to attend her birthday party. Jessica invites Yuna only to humiliate her and get Yuna to clean up before and after. Hamsterviel is inspired by this and outfits wrapper with the ability to trap his enemies in indestructible gift boxes. Experiment appearances: Experiment 521 (Wrapper)

Hiroman's team is going to be on TV, and everyone's getting excited for the event. While trying to return some things, Yuna learns the soccer captain is blackmailed by his sisters, who are Tigerlily's old friends. Meanwhile, Gantu gets the wrong experiment and Dorkifier is released on the town, stitcking people in rediclus outfits. Including Stitch, Yuna, Hiroman and Pleakly. Hiroman's so upset with his new look he doesn't want to come out. Experiment appearances: Experiment 022 (Hertz Donut), Experiment 122 (Dorkifier), Experiment 625 (Reuben)

Yuna's class heads off to camp where she volunteers to help out with the haunted trail in order to spook Jessica. She gets some extra help from Delores, Stitch, Jumba, and Pleaky in doing so. However Gantu's not too far behind with both Toons and Spooky in hopes of catching Stitch. Experiment appearances: Experiment 300 (Spooky), Experiment 112 (Toons),Experiment 047 (Lorider) Experiment 625 (Rueben)

The whole Town's excited over a local limited time only dessert called fluffy rolls. However Stitch's cousin PJ is given a Stitch costume and starts framing Stitch for a verity of pranks.Experiment appearances: Experiment 133 (PJ)

While Delia is away Hamsterviel decides to compete in a child prodigy show on Earth for the big cash prize alongside Reuben and Gantu. Also competing for their school is Jessica, Yuna, and Delores. Realizing the competition is fierce, Hamsterviel decides to cheat with Spike's help.Experiment appearances: Experiment 319 (Spike)

Gantu and Reuben trick the kids into going to a deserted island to find a flower said to grant wishes. Only they find Sprout, now upgraded with 627's DNA.Experiment appearances: Experiment 509 (Sprout)

Stitch and Yuna go back in time to the day Jumba built Stitch

Yuna, Stitch, and Pleakley have messed up the timeline by traveling to the past and Jumba must finish building Stitch before it is too late.

Experiment appearances: Experiment 267 (Wishy-Washy)

Experiment appearances: Experiment 021 (Twang/Flute), Experiment 625 (Reuben)

Experiment appearances: Experiment 610 (Witch), Experiment 625 (Reuben)

Hamsterviel disguise himself as a substitute teacher to get close to Stitch. Only problem is, he's starting to like the job.Experiment appearances: Experiment 515 (Deforestrator), Experiment 625 (Reuben)

Yuna has to do a report on Shoguns and what they eat so she borrows Toons to bring a picture of a shogun's dinner to life, only to bring an actual Shogun to life. Not only does she have to hide him, Tigerlily falls for the shogun and Hamsterviel decided to upgrade Kixx with a katana.Experiment appearances: Experiment 112 (Toons), Experiment 601 (Kixx), Experiment 625 (Reuben)

Yuna gets turned into a puppy by Elastico and Stitch must rescue her. Experiment appearances: Experiment 345 (Elastico), Experiment 625 (Reuben)

Toriko, the tall girl of Jessica's group, signs up for a teenage beauty contest along side Jessica. Feeling crushed, she accepts Yuna's help in the event. However Hamsterviel, having bad memories about Homecoming, sends down a stronger Thresher to wreck the show.Experiment appearances: Experiment 544 (Thresher), Experiment 625 (Reuben)

Angel cheats on Stitch with Reuben. Experiment appearances: Experiment 624 (Angel), Experiment 625 (Reuben)

Stitch plans a Christmas party and invites Yuna's father and grandmother to New Town to surprise Yuna. Meanwhile Hamsterviel gives out clones of Mr. Stenchy and Mrs. Sickly out as presents as part of an evil plot. Experiment appearances: Experiment 254 (Mr. Stenchy), Experiment 255 (Mrs. Sickly), Experiment 625 (Reuben)

Stitch and Hiroman swap bodies. Experiment appearances: Experiment 355 (Swapper), Experiment 609 (Heat), Experiment 625 (Reuben)

Stitch sabotaged to important ready-made Yuna. Repent and see another important one breaking "Yuna and short finger and promise. However, whatever old's has returned to the savage aliens because of the aliens appearance to reconstitute "retro" stitch on core! In addition, behemoth in the power of another alien stitch rampaging on instinct. At this destroyed city is screwed up! "Stitch, I promise to remember! "Or the voice of Yuna to appeal desperately to reach stitch in mind! Experiment appearances: Experiment 001 (Shrink), Experiment 110 (Squeak), Experiment 177 (Clip), Experiment 204 (Nosox), Experiment 210 (Retro)

Reuben pretends to be Angel and invites Stitch and friends onto a cruise ship where Hämsterviel plans to throw Stitch overboard so he can catch him without resistance. Experiment appearances: Experiment 523 (Slushy), Experiment 602 (Sinker), Experiment 624 (Angel) costume, Experiment 625 (Reuben)

Lilo who is now a fully grown adult and has a daughter who looks identical to her, visits Okinawa. Initially not wanting to see Stitch as he left after she couldn't visit from college because of her sister being pregnant, it takes her daughter to reunite her with Stitch. They have a happy reunion after being apart for so long. Experiment appearances: Experiment 316 (Morpholomew)

Hämsterviel sends Babyfier to turn Stitch and friends into children so Stitch would be easier to catch. Experiment appearances: Experiment 151 (Babyfier)

It's Valentine's day and everyone goes to a chocolate factory where Angel is performing. After the concert, they all go and make personalized chocolate valentines, but Hämsterviel is scheming to use Fudgy. Experiment appearances: Experiment 054 (Fudgy), Experiment 624 (Angel)

It's Yuna's birthday, but she thinks everyone has forgotten...even Stitch! While preparing Yuna's surprise party, Stitch falls asleep and Hämsterviel sends Remmy to trap him in his own dreams, causing Stitch to fall ill. Experiment appearances: Experiment 276 (Remmy), Experiment 624 (Angel)

Checkers escapes Hämsterviel and runs amok at Yuna's school, causing the students to fight for the power to control everyone. Experiment appearances: Experiment 029 (Checkers)

Hämsterviel alters Dupe so each duplicate made is stronger than the last. Stitch decides to use Dupe so that he can get out of his chores and trouble ensues. Experiment appearances: Experiment 344 (Dupe)

Deila finishes making a new experiment who is stronger than Stitch named "Dark End". Dark End and Stitch battle, leaving Stitch unconscious. Experiment appearances: Experiment 110 (Squeak), Experiment 133 (PJ), Experiment 151 (Babyfier), Experiment 262 (Ace), Experiment 316 (Morpholomew), Experiment 319 (Spike), Experiment 345 (Elastico), Experiment 619 (Splodyhead), Experiment 624 (Angel), Experiment 625 (Reuben)

Ace appears to save the day and Stitch decides to help him. Experiment appearances: Experiment 262 (Ace)