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.

Stitch and Yuna find a mysterious yellow alien flutist, who quickly gets everybody's collective attention. What nobody realizes is Flute (named Bragg in the Japanese original) is actually Experiment 145 (misnumbered 021, the number of "Twang", in the Japanese original), who not only frames Stitch for mass destruction but the more attention he gets, the stronger Flute becomes, even to the point where he can outdo Stitch.