It's Hallowe'en! Lilo has dressed up as a gory character, while Nani is trying to get everything ready for the trick-or-treaters. Sadly, the house never gets any trick-or-treaters, but Nani wants to fix this. However, Experiment #300, Spooky, is activated, and it can turn into anyone's greatest fear. So, it makes it's way to Kaiaulu Hale's Hallowe'en party, and is terrifying everyone. Can Lilo and Stitch stop it?