Stitch!

A Recurring Nightmare (2x13)

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Because her mother died when she was a baby, Yuna does not remember her face. On a certain night, Stitch finds out, and Experiment 276 (Remmy) entered Yuuna's dreams and turns it into a nightmare. Stitch, Jumba and Pleakley rush after 276 to get Remmy out and save Yuna. Ultimately Remmy is captured and he allows Yuna to see her mother's face.