Walt Disney's beloved space alien finds that his adventure has only begin when Dr. Hamsterviel breaks out of prison and creates an army of evil Stitch twins in a nefarious attempt to overthrow the universe. Having been rewarded for capturing all 625 experiments by being allowed to choose precisely where they want to reside in the galaxy, Lilo, Stitch, Pleakley, and Jumba are soon troubled to discover that the devious Dr. Hamsterviel has escaped the confines of prison and forced Jumba to create Leroy -- a troublesome doppelganger of Stitch with an unquenchable appetite for destruction. When Dr. Hamsterviel begins to clone Leroy in hopes of creating a powerful army with which to rule the stars, Lilo, Stitch, and the rest of the gang must come together to conquer an enemy whose strength lies in numbers and defeat the dreaded doctor once and for all.