Morticia Frump readies for her wedding to Gomez Addams. They marry in front of the Addams clan and the Frump clan, but all are chased away by an angry mob that disapprove of their macabre nature. As the mob attacks with the priest that's related to them speeding up the event, Grandmama buys Uncle Fester time to get Gomez, Morticia, and Thing away from the attackers. Gomez and Morticia decide to move to New Jersey, a place where "no one would be caught dead in." There, Gomez, Morticia, and Thing find their "perfect" home in an abandoned haunted asylum on a hill where they meet Lurch, an escaped mental patient, whom they immediately recruit as their butler. The asylum's spirit demands that Gomez and Morticia get out.
Thirteen years later, the Addams family have since then lived their lives in isolation from the outside world. Gomez prepares his son Pugsley for his upcoming Mazurka, a rite of passage every Addams family member takes, as Uncle Fester arrives. Morticia struggles to keep their daughter Wednesday from wanting to experience the world outside of the mansion after a balloon and confetti appear on their property. The Addams Family and their pet Kitty Kat explore the area.
Elsewhere, reality TV host Margaux Needler, who is building a perfect planned community called "Assimilation", discovers the Addams family's household and becomes determined to rid the town of it when the family refuses to change. Wednesday meets Margaux's neglected daughter Parker and convinces Morticia to let her attend junior high school. Pugsley struggles with the complicated traditions and pressure of his Mazurka, even with the guidance of Gomez and Uncle Fester. Grandmama even shows up for the upcoming event.
At school, Wednesday defends Parker from a school bully named Bethany and befriends her. Later, the two discuss their frustrations and change their dressing habits. Morticia does a seance where she contacts Granny Frump and Grandpa Frump, who compare Wednesday distancing herself from Morticia with the time when Morticia ran away and joined the Girl Scouts, only to return when she discovered that campfires were for roasting marshmallows and not other Girl Scouts. Gomez and Fester continue training Pugsley for the Mazurka. When it comes to a change in their dressing habits, Parker becomes more Gothic and Wednesday dresses more colorfully, to the shock of their mothers. After an argument with Morticia, Wednesday decides to run away in secret and stay with Parker, which Pugsley inadvertently tells Morticia; Morticia is guilt-ridden as she watches Wednesday leave from the window in the children's room.
The next day, Cousin Itt arrives at the Addams Family house. Wednesday and Parker discover a secret room under Parker's house, revealing that Margaux has been planting hidden cameras in every house she designed in town; Margaux catches the two and locks them in the attic, but Wednesday breaks them out. Spreading rumors about the Addams family through social media, Margaux rallies an angry mob to attack the mansion just as the entire Addams clan, including Petunia, Uncle Onion, Dr. Flambe, and other unnamed relatives, arrives for Pugsley's Mazurka, where Great Auntie Sloom will judge the event.
During the Mazurka, Pugsley fails miserably in front of the whole family, but Gomez reassures him he is an Addams nonetheless, and also apologizes for letting Pugsley down, explaining that he was so focused on doing things traditionally that he forgot to let Pugsley be himself. The mob arrives and begins flinging boulders, severely damaging the house and trapping the family inside while sending the house's spirit flying into the swamp. With encouragement from his father to show them what he's good at, Pugsley uses his love of bombs and destruction to protect his family and manages to destroy the mob's catapult. With help from the sentient tree Ichabod, Wednesday and Parker join in and help the entire family and Wednesday's pet octopus Socrates out of the wreckage safely.
As Margaux tries to take control once more, her treachery is revealed to the people, with one of them saying that Margaux's spying on them with hidden cameras is over the line. Wednesday states that everyone is weird in their own unique way, and Morticia realizes she is right. When Margaux's agent Glenn forwards a message from the network stating that her show is cancelled for crimes, thanks to Parker live-streaming her tirade with her phone, Uncle Fester comes up with a compromise. The town realizes the error of their ways, and helps rebuild the mansion.
The civilians and the Addams family live in peace where Thing is walking Kitty Kat. Margaux becomes partners with Fester in selling homes to the other Addams Family relatives; the unnamed priest modifies his house with an interior typhoon.
As the Marzurka resumes, Great Auntie Sloom declares that Pugsley has passed the trial. As everyone dances, the spirit re-enters the house trying to get everyone to leave as the fog and clouds return, much to the delight of the Addams Family.
- The book The Terror is a play on the Torah.
- The movie ends with an animated recreation of the intro of the 1964 TV show.
- Following the film's successful opening weekend, it was announced 15 October 2019 that a sequel to the film was scheduled to be theatrically released 22 October 2021. Greg Tiernan and Conrad Vernon will return to direct the film.
- Lurch's facial design was based on a caricature of American actor Michael Shannon.
- The song that Uncle Fester sings, "I Haven't Got a Hat", was originally featured in a 1935 Merrie Melodies cartoon of the same name.
- When Wednesday brings in a red balloon, Morticia says that sometimes there is a clown attached to the back of one, a reference to the movie IT.
- Lurch plays piano almost throughout the movie, and one of the songs he plays is Mr. Roger's Neighborhood.
- Oscar Isaac as Gomez Addams
- Charlize Theron as Morticia Addams
- Chloë Grace Moretz as Wednesday Addams
- Finn Wolfhard as Pugsley Addams
- Nick Kroll as Uncle Fester
- Snoop Dogg as Cousin Itt
- Bette Midler as Grandmama
- Allison Janney as Margaux Needler
- Conrad Vernon as Lurch, Priest, Spirit of the House, Dr. Flambe
- Elsie Fisher as Parker Needler
- Aimee Garcia as Denise
- Catherine O'Hara as the Spirit of Granny Frump
- Martin Short as the Spirit of Grandpa Frump
- Tituss Burgess as Glenn
- Jenifer Lewis as Great Auntie Sloom
- Pom Klementieff as Layla, Kayla
- Scott Underwood as Mitch
- Chelsea Frei as Bethany
- Mikey Madison as Candi
- Deven Green as Ms. Gravely
- Maggie Wheeler as Trudy Pickering
- Harland Williams as Norman Pickering, Ggerri
ADR work by Patty Connolly, Chris Cox, Debi Derryberry, Darin De Paul, Benjamin Diskin, Sandy Fox, Bridget Hoffman, Amad Jackson, Shakira Ja'Nai Paye, Lex Lang, Cassandra Morris, Erin Myles, Ben Pronsky, Michelle Ruff, Warren Sroka, Mark Sussman, Shane Sweet, Kari Wahlgren, Audrey Wasilewski, Lisa Wilhoit, Scott Whyte, and Adam Wylie.
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