Liz decides the family needs a nanny. Unfortunately she employs a girl who Bob stood up as a prom date after realizing Liz was interested in him. Having gained access to the house the spurned lover turns all her energies to becoming the new Mrs Pitts.
Faith convinces her parents she needs a car. They ultimately purchase a VW bug that Faith discovers is haunted. Aside from this she discovers she is falling in love with the spirit possessing the vehicle.
Bob and Liz are bitten by werewolves and begin to transform each night into monsters. The children go to huge lengths to help their parents and try to keep them out of trouble. The parents are impressed by the amount of effort their presumed lazy children go to.
Bob in an attempt to save Petey's birthday party pulls out an old possessed ventriloquist dummy and becomes the hit of the party. In return Bob has to agree to let the dummy live with the family. The dummy now free goes on a rampage to destroy Bob's family and his life.