As Blondie and Dagwood prepare to celebrate their fifth wedding anniversary, the joyous occasion is spoiled by Dagwood's clumsy involvement in a scheme that could bring financial ruin for the Bumsteads.
Dagwood resigns from his job after being denied leave, so Blondie asks his boss, Dithers, to give her husband his job back. He agrees on the condition that Blondie runs the office while he is in Washington to close a deal.
The Bumsteads spend their summer vacation in the mountains. The man they had issues with during the journey turns out to be the owner of the place they are staying when they get off the train. While searching for another hotel, they come across one that is owned by an old couple and is in danger of...Read more going bankrupt. The Bumsteads make the decision to take charge of running the hotel and assist in saving it.
Blondie buys a number of parenting books and enrolls her son, Baby Dumpling, in school because she believes he is a child genius. But when Dumpling's dog, Daisy, goes missing, Baby Dumpling goes in search of him.
Blondie wants a fur coat, while Dagwood wants to join the trout club. When Dag's ex-girlfriend Joan appears, jealousy takes over, but this is all that matters when an illustration at the movie theater earns the coat's cost.
Due to rumors that it is haunted, Mr. Dithers is unable to sell his house. He lets the Bumsteads move in, and they find hidden passageways and sliding panels. It turns out that the butler and his wife are responsible for the haunting since they believe the mansion is theirs.
The Bumstead family goes to visit Aunt Hannah at her rural farm. Along the way, Blondie meets runaway couple Charlie and Millie, who need her help to broker a marriage agreement with their parents. When Blondie and Dagwood step in to help them, Alexander Bumstead accidentally detonates a stick of...Read more dynamite, causing a panic and a series of comical situations.
Blondie takes her family on a trip to Latin America, where Dagwood disguises himself as a drummer in a conga band on a cruise ship in South America, while Blondie performs a number of singing and dancing shows.
Dagwood Bumstead brings home a purebred Great Dane named Daisy, requested by one of the company's important clients. Blondie enrolls her in a dog competition, which causes comical situations, most notably a belching display.
Dagwood makes the decision to attend college. Blondie follows his lead while hiding their marriage. Baby Dumpling is sent to military school and rises to the rank of top sergeant. Dagwood joins the rowing squad as Blondie is harassed by the campus stud. Dithers comes up with a scheme to interfere...Read more with their education, causing conflict and requiring them to deal with unforeseen difficulties.
After a particularly turbulent day at the hospital, Blondie Bumstead gives birth to her newborn, Cookie. Meanwhile, satirical writer George Wickley arrives at Dagwood Bumstead's house, with no one available to serve him. Everyone is at a loss as to where to sleep and what to do with him, especially...Read more since he's been a voracious eater.
Housewives are recruited by Blondie for wartime tasks. As the husbands object to household duties, Dagwood pretends to be enlisting in the army. Blondie goes back home after disbanding the housewives' group.
Dagwood pools all his savings, along with his wife's, to buy the new house they had been dreaming of for a long time, especially after the family had grown with the arrival of Cookie. Dagwood goes to buy the house, but he returns with a horse, which he dreams of entering races to make money from.
A wealthy tool manufacturer hires Dagwood to work in a new factory, but Blondie, Dagwood's wife, turns things around when she chooses the rich man's daughter to participate in a play.
Dagwood Bumstead and his wife Blondie wrote charitable checks without each other's knowledge, and to cover the amounts they donated, they enter a songwriting contest. Meanwhile, Mr. Dithers asks Dagwood to win over a female client of the company to complete a real estate deal.
Daisy, the Bumstead family dog, becomes a famous model, gaining widespread fame until she catches the attention of a gangster's girlfriend, who convinces the gang to kidnap Daisy for ransom money, so Blondie and Dagwood rush to rescue their dog.
While Dithers is out of town, Dagwood runs the office and hires the architect Mary Jane, a discharged WAC. But after Dagwood and Mary Jane end up getting fired, the Bumsteads start their own business, but encounter a series of mishaps.
Dagwood needs some money, so he impersonates Mr. Dithers, the company's owner, to complete a business deal. He becomes a guinea pig who is injected with a new truth serum, and thanks to his ability to tell the truth, he succeeds in winning a new contract for Dithers and gets a raise.