Halloween.Clover is stuck babysitting Chucky, the obnoxious son of her Mom's best friend, on Halloween night, but luckily she is able to rope Sam and Alex into hanging out with her so it will not be such a drag. The girls take Chucky trick or treating in the eerie gated community he lives in, but none of the neighbors seem to be home. They soon find out that a demon inadvertently awakened by Mandy has taken over the gated community and turned its inhabitants into ghouls bent on taking over the world. Clover unwillingly becomes a hideous ghoul, undergoing another painful transformation. Can Sam and Alex totally survive the monster attack and turn things back to normal before Chucky's mother gets home? In the subplot, Jerry is going to his first ever Halloween party and keeps seeking the girls' advice on costumes.