Wednesday Addams is sent to Nevermore Academy, a bizarre boarding school where she attempts to master her psychic powers, stop a monstrous killing spree of the town citizens, and solve the supernatural mystery that affected her family 25 years ago — all while navigating her new relationships.

Siblings Wednesday and Pugsley Addams will stop at nothing to get rid of Pubert, the new baby boy adored by parents Gomez and Morticia. Things go from bad to worse when the new "black widow" nanny, Debbie Jellinsky, launches her plan to add Fester to her collection of dead husbands.

The Addams family's lives begin to unravel when they face-off against a treacherous, greedy crafty reality-TV host while also preparing for their extended family to arrive for a major celebration.