Halloween episode. Experiment 300 is discovered, which can morph into a person's worst fear. It is revealed that Mertle and her friends' worst fear is seeing Lilo without her head, and Lilo has fears of clowns and an abandoned house. Stitch's worst fear is water, and Nani's worst fear is hearing Cobra Bubbles say that he has to take away Lilo. Moses has a fear of spiders, Jumba's worst fear is his ex-wife, and Pleakley's worst fear is his mother disappointed with him.