Teddy takes a handyman job next door to the restaurant and finds himself trapped inside a store full of spooky antiques, which the kids quickly learn they can take advantage of. Bob and Linda try to find a moment of peace to themselves on Halloween, to limited success.

1970s Springfield is menaced by a grease monster that feeds on human fat, Krusty makes a deal with the devil on his live Halloween special, and in a poseable plastic post-apocalyptic future, Bart and Lisa fight for the future of humanity.