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.
When an evil doctor finds out Uncle Fester has been missing for 25 years, he introduces a fake Fester in an attempt to get the Addams family's money. Wednesday has some doubts about the new uncle Fester, but the fake uncle adapts very well to the strange family.
Three guys find a space alien in the woods and attempt to sell it to a tabloid TV show, with disastrous results.