Lawyer Dave Crabtree's troubles begin with the purchase of a decrepit 1928 Porter that claims through the radio to be his mother. Wife, Barbara doesn't want the old wreck but it has an overwhelming appeal for Captain Manzini, a very persistent antique car collector.
Dave fears for his mother's safety when car strippers are reported in the neighborhood.
As Dave drives up the mountains, Mother gets higher and higher from the alcohol in her antifreeze.
When Dave neglects to set the parking break after parking on a hill, Mother rolls into an open van that is bound for Mexico.
Dave's mother badgers him into patching up the quarrel between the battling newlywed couple who lives next door.
In a desperate effort to get the car away from Dave, Captain Manzini resorts to: Operation Unscrupulous, replacing the car with an exact replica.
Dave gets back at his neighbors who are petitioning him to get rid of his antique eyesore by starring the car in a TV commercial.
Captain Manzini goads Dave into racing the car against England's foremost distance walker with Mother as the stakes.
Dave's mother is tired of spending night after night in a dark garage so she tries to get Dave to by her a TV set.
Dave's mother and the rest of his family all want air conditioners. So to handle the expense, Dave must land the account of high living Franklyn Hotchkiss.
Mother tells Dave how to impress two stiffnecked council members who are interviewing prospects for judgeship in the domestic relations court.
Dave's mother wants to celebrate her birthday by seeing a surf movie featuring her favorite actor, at a chilly open-air theater.
Dave hears that Captain Manzini is dying but Mother warns him that Captain Manzini is up to something.
Dave's mother in-law arrives for a visit and it's soon apparent that there is one mother too many on the scene.
Mother is furious when she learns that Dave intends to let Barbara choose her own Christmas present.
After being married for 8 years, Barbara and Dave decide to go on a honeymoon. However, Barbara's mother, an astrology nut, warns them of impending danger.
A collision with a truck leaves Mother with amnesia and Dave with a problem, how to bring back a car's memory.
Captain Manzini's uncle Louie, the head of a secret organization called DURC, says his hypnotic drug will make Dave agreeable to any request such as selling Mother.
Captain Manzini offers Dave one last chance to sell his antique car before using a molecular compressor to shrink it to the size of a small toy.
When the housework gets Barbara down, Dave surprises her by hiring a maid who's unbearably efficient.
While driving the kids to camp, Dave is stopped by a sheriff who asks him for his driver's license and discovers that it has expired.
How can a car prevent a murder? That's what Mother has to figure out after she overhears three thugs plot the assassination of a visiting dignitary.
Mr. Kroot, the postman, know two thing about Dave. He saw Dave cementing the garage floor and also heard him say something about his mother not complaining anymore. So Kroot concludes that Dave has done his old lady in.
Captain Manzini transforms a Swedish sailor into a lookalike, talkalike replica of Dave and smuggles him into the Crabtree household.
The future looks mighty bleak for Dave's mother when Barbara wins a new limousine in a supermarket drawing.
It's mutual love at first sight for Mother and wealthy Conrad Byron who offers to trade him limousine and chauffeur for Dave's car.
Prudish building owner, Henry Heckendorn asks Dave to help him try to close the Greek Grotto, a notorious night club but Dave's mother suspects Heckendorn's motives.
Dave returns from work too exhausted to think straight and he accidentally lets it slip that the car is really his mother.
Dave's mother allows the children to think that she like, Aladdin's lamp, can grant any wish.