Lilo and Stitch are on the track of Experiment 513, the aptly named Richter, who can cause earthquakes and his creations are potentially devastating, and while chasing him Stitch learns an important lesson.

When Experiment 375, a phantom-like experiment designed to inhabit an animate inanimate objects, gets loose it inhabits Lilo's doll Scrump. Chaos ensues and Stitch gets the blame.

Lilo tries to sabotage Mertle's new hairdo by letting loose a hair-eating experiment, but it backfires when Mertle's mum's hair is attacked instead.

Experiment 254 is cute, but he's also a stink bomb. Stitch is jealous and tries to get rid of him, but ends up retrieving him, because Lilo's so sad.

Trick or treaters never visit Lilo's house because it's too isolated - until she encounters Experiment 300, who makes people's worst fears come true.

Mertle is given a bracelet with an unactivated experiment attached. Lilo knows she must retrieve it, especially when she finds that it will create a black hole that could suck in the whole world.