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 210: RETRO

Nani meets some of her friends from high school and tries to impress them by saying she is vice president and they convince her to introduce them to her family. The day only gets worse when experiment 210, tries to revert everyone back to a prehistoric state...