Lilo dresses up as a bloody gory character; Nani tries to get everything ready for when the trick-or-treaters arrive.
But sadly, the house never gets any trick-or-treaters, a fact that Nani wants to change.
Meanwhile, Experiment #300, Spooky, is activated.
Experiment #300 can transform into anyone's greatest fear, and makes his way through the town spooking on people.
When Lilo finds out that #300 made its way to Kaiaulu Hale's Halloween party, she tells Stitch to go after it.
Unfortunately, Stitch won't go because #300 has transformed into Stitch's worst fear: Water! But when Lilo is in danger, Stitch is willing to face his fears.