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Taking place before the events of "Boss" and "Dark-End", Ace appears to save the day and Stitch decides to help him. However, Ace's relentless and restless heroism causes him to develop back and body aches, depleting his powers and confidence.
Delia finishes making a new experiment who is stronger than Stitch named "Dark End". Dark End and Stitch battle, leaving Stitch unconscious.
To confront a planetary war at the sand planet of Katūna, Stitch must leave Yūna and Earth behind.