Lilo & Stitch: The Series - Season 1 - Eps 28: Dupe
Experiment #344 - Dupe Lilo and Stitch have managed to capture Experiment #344, who can duplicate anything. This leaves Gantu feeling down, so he goes home to talk to 625 about it. However, 625 gets bored and tells him he doesn't care, causing Gantu to go off in a rage. Meanwhile, Lilo, who has hosted a slumber party but no one turned up, decides to clone herself using #344, but Stitch jumps in the way, creating an extra 3 copies of himself, who all need training. Gantu, in his rage, discovers 4 experiment pods: Heat, Plasmoid, Thrasher and HammerFace. He activates them and plans an attack on Lilo and Stitch. But surely 4 Stitches can beat Gantu.. Right?
About Lilo & Stitch: The Series

Title: Lilo & Stitch: The Series
First Air Date: 2003-09-20
Last Air Date: 2006-07-29
Status: Ended
Rating: 7.38/10 (from 576 votes)
Language: EN
Seasons: 2
Total Episodes: 67
Network: ABC Disney Channel
Genres: Animation, Family, Comedy, Action & Adventure, Sci-Fi & Fantasy, Kids
Production Companies: Disney Television Animation
Synopsis
This animated series chronicles the further adventures of renegade scientist Dr. Jumba Jookiba's beloved Experiment 626, who is now living happily as Lilo's alien buddy Stitch. Jumba’s remaining experiments have landed all over Hawaii in the form of dehydrated pods. Lilo and Stitch’s mission is to catch Stitch’s "cousins" before they fall into the clutches of the evil Dr. Jacques von Hamsterviel!
Cast

Daveigh Chase
Lilo Pelekai (voice)

Chris Sanders
Stitch (voice)

David Ogden Stiers
Dr. Jumba Jookiba (voice)

Kevin McDonald
Pleakley (voice)

Tia Carrere
Nani Pelekai (voice)

Kevin Michael Richardson
Captain Gantu (voice)