Addams Family Values/Best scene/Raul Julia/Anjelica Huston/Christina Ricci/Jimmy Workman

Gomez and Morticia Addams hire a nanny named Debbie to take care of their newborn son, Pubert, after older siblings Wednesday and Pugsley's failed attempts to murder him. Unbeknownst to them, Debbie is a serial killer who marries rich bachelors and murders them to collect their inheritances.

After Debbie seduces Uncle Fester, Wednesday becomes suspicious of her intentions. In order to maintain her cover, Debbie tricks Gomez and Morticia into believing Wednesday and Pugsley want to go to summer camp. They are sent to Camp Chippewa, managed by the overzealous Gary and Becky Granger, where they are singled out by the counselors, as well as popular girl Amanda Buckman, for their macabre dress and behavior. Joel, a nerdy bookworm who also does not fit in, becomes interested in Wednesday.

Debbie and Fester become engaged. At their bachelor and bachelorette parties, Debbie is horrified by the Addams family. On their honeymoon, she tries to kill Fester by throwing a boombox in the bathtub, but the attempt fails. Frustrated, Debbie forces him to sever ties with his family; when they try to visit Fester at Debbie's mansion, they are removed from the premises. The Addams are alarmed to find that Pubert has transformed into a rosy-cheeked, golden-haired baby. Grandmama Addams diagnoses this as a result of his disrupted family life, and Gomez becomes depressed.

At camp, Wednesday is cast as Pocahontas in Gary's saccharine Thanksgiving play. When she refuses to participate, she, Pugsley and Joel are forced to watch upbeat Disney and family films. Afterwards, Wednesday feigns cheerfulness and agrees to take part. During the performance, she stages a coup, capturing Amanda, Gary and Becky, and setting the camp on fire. She, Joel and Pugsley escape via a canoe, and Wednesday and Joel kiss.

Debbie tries to kill Fester by blowing up their mansion. Debbie thinks she has finally killed Fester, but it turns out he actually survived the explosion. After this, she pulls a gun and tells him she does not love him and is only interested in his money. Thing intervenes and Fester escapes. Fester apologizes to Gomez, and Wednesday and Pugsley return, reuniting the family. Debbie arrives and ties the family to electric chairs, explaining that she killed her parents and previous husbands for incredibly selfish and materialistic reasons while the Addams listen with sympathy and compassion. Upstairs, Pubert, who has returned to normal, escapes from his crib and is propelled into the room where the family is being held. Debbie throws the switch to electrocute the family, but Pubert manipulates the wires and electrocutes her instead of the family, incinerating her into a pile of ash.

Months later, at Pubert's first birthday party, Fester laments Debbie's loss but becomes smitten with another nanny, Dementia. In the Addams family graveyard, Wednesday tells Joel that Debbie was a sloppy killer, and she would instead scare her husband to death. As Joel lays flowers on Debbie's grave, a hand erupts from the earth and grabs him; he screams while Wednesday smiles.