Halloween with the New Addams Family is a 1977 American made-for-television comedy horror film based on the 1964–1966 sitcom The Addams Family. In contrast to the "new" in the title, most of the original series regulars reprised their roles, including John Astin, Carolyn Jones (billed as a "special guest star"), Jackie Coogan, Ted Cassidy, Lisa Loring, Ken Weatherwax and Felix Silla. Made more than eleven years after the cancellation of the 1960s TV series, it was the only film that brought together most of the original actors.
Gomez's brother Pancho is staying with the Family while Gomez goes to a lodge meeting in Tombstone, Arizona. Gomez is jealous of his brother, who once courted Morticia. Halloween is nigh and Pancho tells the legend of Cousin Shy, who distributes gifts and carves pumpkins. Actually, Gomez has been lured off by crooks who have bugged the house in order to steal the Family fortune.
The lead crook "Bones" Lafferty sends Mikey to investigate. Wednesday (Senior) is home from music academy, where she studied the piccolo (she breaks glass with it). Pugsley (Senior) is home from Nairobi medical school, where he's training to be a witch doctor. Mikey panics and flees after treading on Kitty Kat's tail. The crooks have 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 Addams (from Boston) to get in. He has his men tie up Gomez and Morticia and his doubles take their places, confusing Pancho, who's still got the hots for Morticia. Lurch scares off the thugs and terrifies the assistant crook Louie the Lard (who was dressed as Little Bo Peep). 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 upon responding to a noise complaint, Lafferty and his gang surrender.
The Addams Family are then free to celebrate Halloween happily, ending the night by singing together in welcome for Cousin Shy.