Uncle Fester has been missing for 25 years. An evil doctor finds out and introduces a fake Fester in an attempt to get the Addams Family’s money. The youngest daughter has some doubts about the new uncle Fester, but the fake uncle adapts very well to the strange family. Can the doctor carry out her evil plans and take over the Addams Family’s fortune?

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.