On Halloween, Billie tells Roman about Pumpkin Belly, a ghoul who eats anyone whose house isn't spookily decorated. Meanwhile, Justin, Milo & Giada defend the home from pranksters.

When Billie's neighbor, Bella Bianchi, sees her using magic, Billie and Milo try to convince her it is fake ... until their efforts result in Bella getting stuck in the lair.

When Billie can't join Roman and Winter's team for a robotics competition, she enlists Milo and uses magic to design an over-the-top robot of their own with disastrous results.