Tim Curry as Gomez Addams discovers that his grandparents have developed "Waltzheimer's disease," a condition that slowly turns them toward normalcy and cools the wild charm that defines the Addams clan. To chase a cure, he arranges a sprawling family reunion, hoping that some distant branch of this enormous dynasty might hold the missing piece. Yet disaster strikes early when a card written in blood sabotages the reunion organizer’s machines, delivering the wrong invitation to the Addams household and launching the gathering on an unintended path.
With Gomez, Morticia, Fester, Lurch, and the grandparents heading to a lavish resort for the reunion, the stage is set for a collision of two worlds. Daryl Hannah as Morticia Addams encounters Dr. Philip Adams and his sister Katherine Adams, portrayed by Ed Begley Jr. and Hilary Shepard. The pair covet their wealthy father Walter Adams to secure an inheritance and are willing to frame their younger brother to seal the deal. The tension of their schemes looms over everything, even as the resort’s glittering surface tempts the Addamses with its comforts.
Back at the mansion where Granny and Cousin Itt stay as guests, Alice Ghostley and Phil Fondacaro become unwitting participants in a web of manipulation. Granny soon learns that the wife of the younger brother is vegetarian, and she retaliates in her own blunt way by offering a deadly plant: nightshade. Meanwhile, Cousin Itt shakes the money tree by playing poker with the husband and winning most of the man’s fortune, adding another layer to the family’s chaotic ruse.
Amid the misadventures, Pugsley Addams finds a reason to smile when he falls for Gina Adams, the daughter of Katherine. Haylie Duff brings Gina to life, and her presence deepens the already tangled dynamics as Pugsley’s feelings collide with the snobbish aura of the resort crowd. Nearby, Wednesday Addams clashes with two of her new, haughty cousins—Philip’s children—as she stirs trouble in their curated world. The dark humor of the mansion sharpens, even as Lurch, played by Carel Struycken, rises from danger to rescue Hilary Shepard as Katherine from a near-drowning in the pool, only to reveal a surprising attraction that both unsettles and fascinates her.
Walter Adams, portrayed by Ray Walston, makes his own feelings clear, showing a rot underneath his outward affection for his son and many of the family’s antics. Fester, aided by his companion Thing, does their best to capture Butcher, Fester’s hair-eating mutated puppy, a comic counterpoint to the more serious stakes around wealth and betrayal. The day’s tension reaches a peak when Philip initially refuses to help Gomez but agrees to a bet: if he defeats Gomez in a series of games—darts, table tennis, and tennis—he’ll earn thousands of dollars; if Gomez wins, Philip will offer his services to the Addams clan. Philip’s overconfidence proves costly, and Gomez easily bests him, humiliating him in public.
Enraged, Philip attacks Gomez with a knife as the police close in. The dream of a cure shatters into chaos as Gomez and Morticia are arrested for attempted murder; Pugsley and Wednesday are taken by child services for digging up the resort’s founders’ grave; Fester is ruled insane and institutionalized; Butcher and Thing are captured by the resort’s dog catcher; and Lurch is buried alive by Wednesday, unable to escape. The balance of power shifts as the family’s world teeters on the edge of catastrophe.
Walter Adams eventually posts bail for Gomez and Morticia, and the duo manage a daring rescue with Lurch's help, freeing the entire clan from danger. The once-divided family bands together: Pugsley and Wednesday are reunited with their parents, and the Addamses strap Philip into his own electric chair, turning the tables on the man who stood in their way. The rebellious, chaotic energy of the Addams mansion reclaims its place as the family returns to their eerie, beloved home, leaving the now-ordinary grandparents in the care of Philip’s wife.
As the credits edge closer, Wednesday lights fireworks while Pugsley appears oddly pensive. Gomez asks if Pugsley misses Gina, but the boy reveals something else weighs on him—the disappearance of his “Siberian firecracker” he left behind at the foster home. The film then pivots on a final, jaw-dropping reveal: what they believed to be a simple firecracker is actually a nuclear weapon, and they witness a distant nuclear explosion on the horizon. Morticia remarks that a nuclear winter is looming, a melancholy omen that suits the family’s macabre sensibilities. In the end, the couple shares a quiet kiss, sustaining their bond even as the world feels darker and more uncertain.
