The Addams step out of Charles Addams' cartoons. They live with all of the trappings of the macabre (including a detached hand for a servant) and are quite wealthy. Added to this mix is a crooked accountant and his loan shark and a plot to slip in the shark's son into the family as their long lost Uncle Fester. Can the false Fester find his way into the vault before he is discovered?
Uncle Fester has been missing for 25 years. An evil doctor finds out and introduces a fake Fester in an attempt to get the Adams 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 Adams Family's fortune?