A bird has discovered a strange blue ball in her nest. After deciding she doesn't need it, she discards it into the river running below her tree. It turns out it's #520's pod, and it activates. Now the experiment is wreaking havoc over the island with it's huge behind by bouncing and shaking the ground. So, Lilo and Stitch must capture it, but Gantu is on it's trail too.

Experiment #199 - Nosy

Nani wants a job at Mr. Jameson's hotel, so she invites him and his son Keoni over for brunch to prove how much 'Aloha Hospitality' she has. Unforunately, Experiment #199 has been activated, and he seeks out enemy's secrets. However, a glitch in his programming has made him into nothing more than a gossip. So now Lilo and Stitch must stop him blurting out the family's secrets to Mr. Jameson and Keoni.

Experiment #360 - Drowsy

Stitch uses a sleeping experiment to get Lilo to sleep. The only problem is he doesn't know how to wake her up.

Experiment 029: CHECKERS

Lilo is angry and under appreciated about her float not getting chosen for the parade, and being grounded (along with Stitch) by Nani and Pleakley.