Andy Hardy goes to college after serving in the war and finds his sweetheart is engaged to someone else.
All set to graduate from high school , Andy Hardy flunks his English exam - in spite of the fact that Aunt Milly is his teacher, and that the Judge has gone to all the trouble of getting him his very own private secretary.
With his high school graduation behind him, Andy Hardy decides that as an adult, it's time to start living his life. Judge Hardy had hoped that his son would go to college and study law, but Andy isn't sure that's what he wants to do so he heads off to New York City to find a job. Too proud to accept any help from Betsy Booth, Andy finds that living on his own isn't so easy. With perseverance he eventually finds a job and even gets to date the pretty receptionist in his office. He also has to face several of life's lessons leading him to conclude that he may still have a bit of growing up to do.
Judge Hardy takes his family to New York City, where Andy quickly falls in love with a socialite. He finds the high society life too expensive, and eventually decides that he liked it better back home.
Young Andy develops a crush on his drama teacher. When his play is chosen as the school's annual production, Andy seizes the opportunity to spend as much time as possible with his pretty teacher. Meanwhile, Judge Hardy has his own problems when he gets conned into forming a phony aluminum corporation.
While Judge Hardy handles a couple's divorce, Andy takes a shine to their shy daughter.
Judge Hardy guides Andy through problems with girls, money and an essay contest.
Andy Hardy, now a grown man with a wife and children, returns to his hometown on a business trip and finds himself getting mixed up in local politics.
Andy wants to buy a new car so he goes into the judge's home office where his father is about to write a $200 check to charity. He asks his dad for the $200 and they go used car shopping.
Teenagers Scott and Mary are on their way to a Halloween party when their car breaks down, and they encounter a creepy castle where the depraved Dr. Frankenstein seeks to put Scott's brain in his monstrous creation. As for Mary, Count Dracula wants her for... well, you know.