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?

Seventeen year old slacker Anton Tobias wakes up one Halloween morning to discover that both of his parents have been turned into two headless Halloween decorations. After speaking to his equally irresponsible friends, Mick and Pnub, he discovers that his right hand has a blood-thirsty mind of its own and is hell-bent on wreaking havoc whether he likes it or not.

When an adorable baby boy is added to the Addams household, Wednesday and Pugsley do not hate the baby, they just aren't necessarily excited about his existence. Ok, yeah they do hate the baby. So Wednesday and Pugsley must get rid of the new addition one way or another. Meanwhile a new nanny is added to the household who overtakes Fester. The Addams must stop the nanny, but how?