Gomez and Morticia have had two more children, Wednesday Jr. and Pugsley Jr., who strongly resemble their older siblings. Gomez's brother, Pancho, is staying with the family while Gomez attends a lodge meeting in Tombstone, Arizona. Gomez is jealous of his brother, who once courted Morticia. Halloween is near, and Pancho tells the children the legend of the Great Pumpkin-like character of Cousin Shy, who distributes gifts and carves pumpkins for good children on Halloween night. Wednesday (now called "Wednesday Sr.") is home from music academy, where she is studying the piccolo (breaking glass with it). Pugsley (now "Pugsley Sr.") is home from Nairobi medical school, where he is training to be a witch doctor. The family's home has been bugged by a gang of crooks who intend to steal the family fortune. Lafferty, the boss, sends a gang member named Mikey into the house to investigate. Mikey panics and flees after treading on the tail of Kitty Kat the lion. The crooks employ a fake Gomez and Morticia to help in their plans, along with two strong-arm goons, Hercules and Atlas. Gomez returns home for the Halloween party and trimming of the scarecrow. Lafferty poses as Quincy_Adams_station (from Boston) to gain entrance to the house during the party. He has his men tie up Gomez and Morticia and the doubles take their places, confusing Pancho, who is still in love with Morticia, and Ophelia, who is still in love with Gomez. Gomez and Morticia escape (thanks to the "Old Piccolo Game"), and rejoin the party, only to have Lafferty use various methods to try to get rid of them. Lurch scares off the thugs and terrifies Lafferty's other assistant. Fester, trying to be nice, puts Lafferty on the rack. Lafferty tries to escape through the secret passage and steps on Kitty Kat's tail. When the police arrive, the crooks gladly surrender. The Addamses are then free to celebrate Halloween happily, ending the night by singing together in welcome for Cousin Shy.