When Beetlejuice blows up the Monster Across the Street's house, he is obligated to take the Monster and Poopsie in (or Jacques and Ginger will rat him out). Desperate to rid himself of his unwanted roommates, BJ even tries rebuilding the Monster's house for him -- only to find out that the Monster likes the Roadhouse! What will BJ do?
Beetlejuice invents a cologne that changes the personality of anyone it comes in contact with into its polar opposite. When Lydia gets sprayed with it, she becomes a wild, prank-pulling criminal and, taking Beetlejuice along for the ride, wreaks more havoc on the Neitherworld than BJ's ever been responsible for.
Beetlejuice and Lydia decide that it's time for them to have a car of their own, so they rebuild a salvaged one they find in a Neitherworld wrecking yard. But BJ delivers Lydia an abnormal carburetor for installation and although the car they create looks normal at first, it soon becomes evident that he's abnormal.